9csa

TRiC-ATP-AlFx

Method: ELECTRON MICROSCOPY

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1. Protein Identity and Related Structures Protein Identity & Related Structures

T-complex protein 1 subunit alpha

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 16	T-complex protein 1 subunit beta × 2 （P39076） T-complex protein 1 subunit delta × 2 （P39078） T-complex protein 1 subunit epsilon × 2 （P40413） T-complex protein 1 subunit gamma × 2 （P39077） T-complex protein 1 subunit eta × 2 （P42943） T-complex protein 1 subunit theta × 2 （P47079） T-complex protein 1 subunit zeta × 2 （P39079）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TCPA_YEAST
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–559； UniProt 1–559 Author chain a； PDBConstruct 1–559； UniProt 1–559

T-complex protein 1 subunit beta

OrganismNot specified

UniProt P39076

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 16	T-complex protein 1 subunit alpha × 2 （P12612） T-complex protein 1 subunit delta × 2 （P39078） T-complex protein 1 subunit epsilon × 2 （P40413） T-complex protein 1 subunit gamma × 2 （P39077） T-complex protein 1 subunit eta × 2 （P42943） T-complex protein 1 subunit theta × 2 （P47079） T-complex protein 1 subunit zeta × 2 （P39079）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TCPB_YEAST
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–527； UniProt 1–527 Author chain b； PDBConstruct 1–527； UniProt 1–527

T-complex protein 1 subunit delta

OrganismNot specified

UniProt P39078

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 16	T-complex protein 1 subunit alpha × 2 （P12612） T-complex protein 1 subunit beta × 2 （P39076） T-complex protein 1 subunit epsilon × 2 （P40413） T-complex protein 1 subunit gamma × 2 （P39077） T-complex protein 1 subunit eta × 2 （P42943） T-complex protein 1 subunit theta × 2 （P47079） T-complex protein 1 subunit zeta × 2 （P39079）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TCPD_YEAST
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain D； PDBConstruct 1–528； UniProt 1–528 Author chain d； PDBConstruct 1–528； UniProt 1–528

T-complex protein 1 subunit epsilon

OrganismNot specified

UniProt P40413

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 16	T-complex protein 1 subunit alpha × 2 （P12612） T-complex protein 1 subunit beta × 2 （P39076） T-complex protein 1 subunit delta × 2 （P39078） T-complex protein 1 subunit gamma × 2 （P39077） T-complex protein 1 subunit eta × 2 （P42943） T-complex protein 1 subunit theta × 2 （P47079） T-complex protein 1 subunit zeta × 2 （P39079）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TCPE_YEAST
Isoform	—
PDB entities	4
Chains and sequence ranges	Author chain E； PDBConstruct 1–562； UniProt 1–562 Author chain e； PDBConstruct 1–562； UniProt 1–562

T-complex protein 1 subunit gamma

Saccharomyces cerevisiae

UniProt P39077

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 16	T-complex protein 1 subunit alpha × 2 （P12612） T-complex protein 1 subunit beta × 2 （P39076） T-complex protein 1 subunit delta × 2 （P39078） T-complex protein 1 subunit epsilon × 2 （P40413） T-complex protein 1 subunit eta × 2 （P42943） T-complex protein 1 subunit theta × 2 （P47079） T-complex protein 1 subunit zeta × 2 （P39079）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TCPG_YEAST
Isoform	—
PDB entities	5
Chains and sequence ranges	Author chain G； PDBConstruct 1–594； UniProt 1–534 Author chain g； PDBConstruct 1–594； UniProt 1–534

T-complex protein 1 subunit eta

OrganismNot specified

UniProt P42943

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 16	T-complex protein 1 subunit alpha × 2 （P12612） T-complex protein 1 subunit beta × 2 （P39076） T-complex protein 1 subunit delta × 2 （P39078） T-complex protein 1 subunit epsilon × 2 （P40413） T-complex protein 1 subunit gamma × 2 （P39077） T-complex protein 1 subunit theta × 2 （P47079） T-complex protein 1 subunit zeta × 2 （P39079）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TCPH_YEAST
Isoform	—
PDB entities	6
Chains and sequence ranges	Author chain H； PDBConstruct 1–550； UniProt 1–550 Author chain h； PDBConstruct 1–550； UniProt 1–550

T-complex protein 1 subunit theta

OrganismNot specified

UniProt P47079

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 16	T-complex protein 1 subunit alpha × 2 （P12612） T-complex protein 1 subunit beta × 2 （P39076） T-complex protein 1 subunit delta × 2 （P39078） T-complex protein 1 subunit epsilon × 2 （P40413） T-complex protein 1 subunit gamma × 2 （P39077） T-complex protein 1 subunit eta × 2 （P42943） T-complex protein 1 subunit zeta × 2 （P39079）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TCPQ_YEAST
Isoform	—
PDB entities	7
Chains and sequence ranges	Author chain Q； PDBConstruct 1–568； UniProt 1–568 Author chain q； PDBConstruct 1–568； UniProt 1–568

T-complex protein 1 subunit zeta

OrganismNot specified

UniProt P39079

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 16	T-complex protein 1 subunit alpha × 2 （P12612） T-complex protein 1 subunit beta × 2 （P39076） T-complex protein 1 subunit delta × 2 （P39078） T-complex protein 1 subunit epsilon × 2 （P40413） T-complex protein 1 subunit gamma × 2 （P39077） T-complex protein 1 subunit eta × 2 （P42943） T-complex protein 1 subunit theta × 2 （P47079）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TCPZ_YEAST
Isoform	—
PDB entities	8
Chains and sequence ranges	Author chain Z； PDBConstruct 1–546； UniProt 1–546 Author chain z； PDBConstruct 1–546； UniProt 1–546

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	9csa
Deposition date deposition_date	2024-07-23
Structure title title	TRiC-ATP-AlFx
Keywords keywords	Complex, Chaperonin, ATP, CHAPERONE; CHAPERONE
Experimental Method method	ELECTRON MICROSCOPY

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3. Official assembly/model SAXS Official SAXS Profiles

This page reads only the latest assembly calculations. Every curve maps to an explicit PDB entry, official biological assembly and coordinate model.

9csa__assembly_1__model_1

Assembly 1 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

9csa__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

9csa__assembly_1__model_1 | P(r) · Pending

P(r) will be calculated and displayed separately for the same assembly/model.

Rg（Guinier）	66.22 Å
Rg (electron density)	65.01 Å
Total Rg	65.17 Å
Atom count	64996
Residues	8502
Excluded volume	1166100 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`9csa__assembly_1__model_1`	hexadecameric （16）	Success	4.1.3-1-20251215 (887e7ef)	View Download

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4. Crystallography and Experiment 4. Crystallography & Experiment

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5. Entities and Polymers Entities & Polymers (8)

Entity 1 Entity 1 polymer

Description description	T-complex protein 1 subunit alpha
Molecular weight formula_weight	60557.6 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	a,A
Atom count atom_count	64996

MSQLFNNSRSDTLFLGGEKISGDDIRNQNVLATMAVANVVKSSLGPVGLDKMLVDDIGDFTVTNDGATILSLLDVQHPAGKILVELAQQQDREIGDGTTSVVIIASELLKRANELVKNKIHPTTIITGFRVALREAIRFINEVLSTSVDTLGKETLINIAKTSMSSKIIGADSDFFSNMVVDALLAVKTQNSKGEIKYPVKAVNVLKAHGKSATESLLVPGYALNCTVASQAMPKRIAGGNVKIACLDLNLQKARMAMGVQINIDDPEQLEQIRKREAGIVLERVKKIIDAGAQVVLTTKGIDDLCLKEFVEAKIMGVRRCKKEDLRRIARATGATLVSSMSNLEGEETFESSYLGLCDEVVQAKFSDDECILIKGTSKHSSSSIILRGANDYSLDEMERSLHDSLSVVKRTLESGNVVPGGGCVEAALNIYLDNFATTVGSREQLAIAEFAAALLIIPKTLAVNAAKDSSELVAKLRSYHAASQMAKPEDVKRRSYRNYGLDLIRGKIVDEIHAGVLEPTISKVKSLKSALEACVAILRIDTMITVDPEPPKEDPHDH

Entity 2 Entity 2 polymer

Description description	T-complex protein 1 subunit beta
Molecular weight formula_weight	57276.3 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	b,B

MSVQIFGDQVTEERAENARLSAFVGAIAVGDLVKSTLGPKGMDKLLQSASSNTCMVTNDGATILKSIPLDNPAAKVLVNISKVQDDEVGDGTTSVTVLSAELLREAEKLIDQSKIHPQTIIEGYRLASAAALDALTKAAVDNSHDKTMFREDLIHIAKTTLSSKILSQDKDHFAELATNAILRLKGSTNLEHIQIIKILGGKLSDSFLDEGFILAKKFGNNQPKRIENAKILIANTTLDTDKVKIFGTKFKVDSTAKLAQLEKAEREKMKNKIAKISKFGINTFINRQLIYDYPEQLFTDLGINSIEHADFEGVERLALVTGGEVVSTFDEPSKCKLGECDVIEEIMLGEQPFLKFSGCKAGEACTIVLRGATDQTLDEAERSLHDALSVLSQTTKETRTVLGGGCAEMVMSKAVDTEAQNIDGKKSLAVEAFARALRQLPTILADNAGFDSSELVSKLRSSIYNGISTSGLDLNNGTIADMRQLGIVESYKLKRAVVSSASEAAEVLLRVDNIIRARPRTANRQHM

Entity 3 Entity 3 polymer

Description description	T-complex protein 1 subunit delta
Molecular weight formula_weight	57682.4 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	d,D

MSAKVPSNATFKNKEKPQEVRKANIIAARSVADAIRTSLGPKGMDKMIKTSRGEIIISNDGHTILKQMAILHPVARMLVEVSAAQDSEAGDGTTSVVILTGALLGAAERLLNKGIHPTIIADSFQSAAKRSVDILLEMCHKVSLSDREQLVRAASTSLSSKIVSQYSSFLAPLAVDSVLKISDENSKNVDLNDIRLVKKVGGTIDDTEMIDGVVLTQTAIKSAGGPTRKEKAKIGLIQFQISPPKPDTENNIIVNDYRQMDKILKEERAYLLNICKKIKKAKCNVLLIQKSILRDAVNDLALHFLSKLNIMVVKDIEREEIEFLSKGLGCKPIADIELFTEDRLGSADLVEEIDSDGSKIVRVTGIRNNNARPTVSVVIRGANNMIIDETERSLHDALCVIRCLVKERGLIAGGGAPEIEISRRLSKEARSMEGVQAFIWQEFASALEVIPTTLAENAGLNSIKVVTELRSKHENGELNDGISVRRSGTTNTYEEHILQPVLVSTSAITLASECVKSILRIDDIAFSR

Entity 4 Entity 4 polymer

Description description	T-complex protein 1 subunit epsilon
Molecular weight formula_weight	61995.0 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	e,E

MAARPQQPPMEMPDLSNAIVAQDEMGRPFIIVKDQGNKKRQHGLEAKKSHILAARSVASIIKTSLGPRGLDKILISPDGEITITNDGATILSQMELDNEIAKLLVQLSKSQDDEIGDGTTGVVVLASALLDQALELIQKGIHPIKIANGFDEAAKLAISKLEETCDDISASNDELFRDFLLRAAKTSLGSKIVSKDHDRFAEMAVEAVINVMDKDRKDVDFDLIKMQGRVGGSISDSKLINGVILDKDFSHPQMPKCVLPKEGSDGVKLAILTCPFEPPKPKTKHKLDISSVEEYQKLQTYEQDKFKEMIDDVKKAGADVVICQWGFDDEANHLLLQNDLPAVRWVGGQELEHIAISTNGRIVPRFQDLSKDKLGTCSRIYEQEFGTTKDRMLIIEQSKETKTVTCFVRGSNKMIVDEAERALHDSLCVVRNLVKDSRVVYGGGAAEVTMSLAVSEEADKQRGIDQYAFRGFAQALDTIPMTLAENSGLDPIGTLSTLKSKQLKEKISNIGVDCLGYGSNDMKELFVVDPFIGKKQQILLATQLCRMILKIDNVIISGKDEY

Entity 5 Entity 5 polymer

Description description	T-complex protein 1 subunit gamma
Molecular weight formula_weight	65423.4 kDa
Mutation mutation	An internal strep tag and His-tag are between residues 374 and 435
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	g,G

MQAPVVFMNASQERTTGRQAQISNITAAKAVADVIRTCLGPKAMLKMLLDPMGGLVLTNDGHAILREIDVAHPAAKSMLELSRTQDEEVGDGTTTVIILAGEILAQCAPYLIEKNIHPVIIIQALKKALTDALEVIKQVSKPVDVENDAAMKKLIQASIGTKYVIHWSEKMCELALDAVKTVRKDLGQTVEGEPNFEIDIKRYVRVEKIPGGDVLDSRVLKGVLLNKDVVHPKMSRHIENPRVVLLDCPLEYKKGESQTNIEIEKEEDWNRILQIEEEQVQLMCEQILAVRPTLVITEKGVSDLAQHYLLKGGCSVLRRVKKSDNNRIARVTGATIVNRVEDLKESDVGTNCGLFKVEMIGDEYFSFLDNCKEPLEGSGSGWSHPQFEKGSGKRRWKKNFIAVSAANRFKKISSSGALGSGHHHHHHHHGSGLQKACTIMLRGGSKDILNEIDRNLQDAMAVARNVMLSPSLSPGGGATEMAVSVKLAEKAKQLEGIQQWPYQAVADAMECIPRTLIQNAGGDPIRLLSQLRAKHAQGNFTTGIDGDKGKIVDMVSYGIWEPEVIKQQSVKTAIESACLLLRVDDIVSGVRKQE

Source Source

Source organism organism	Saccharomyces cerevisiae
NCBI taxonomy ID ncbi_taxonomy_id	559292
Host organism host_organism	Saccharomyces cerevisiae S288C

Entity 6 Entity 6 polymer

Description description	T-complex protein 1 subunit eta
Molecular weight formula_weight	59802.4 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	h,H

MNFGSQTPTIVVLKEGTDASQGKGQIISNINACVAVQEALKPTLGPLGSDILIVTSNQKTTISNDGATILKLLDVVHPAAKTLVDISRAQDAEVGDGTTSVTILAGELMKEAKPFLEEGISSHLIMKGYRKAVSLAVEKINELAVDITSEKSSGRELLERCARTAMSSKLIHNNADFFVKMCVDAVLSLDRNDLDDKLIGIKKIPGGAMEESLFINGVAFKKTFSYAGFEQQPKKFNNPKILSLNVELELKAEKDNAEVRVEHVEDYQAIVDAEWQLIFEKLRQVEETGANIVLSKLPIGDLATQFFADRNIFCAGRVSADDMNRVIQAVGGSIQSTTSDIKPEHLGTCALFEEMQIGSERYNLFQGCPQAKTCTLLLRGGAEQVIAEVERSLHDAIMIVKRALQNKLIVAGGGATEMEVSKCLRDYSKTIAGKQQMIINAFAKALEVIPRQLCENAGFDAIEILNKLRLAHSKGEKWYGVVFETENIGDNFAKFVWEPALVKINALNSATEATNLILSVDETITNKGSESANAGMMPPQGAGRGRGMPM

Entity 7 Entity 7 polymer

Description description	T-complex protein 1 subunit theta
Molecular weight formula_weight	61735.1 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	q,Q

MSLRLPQNPNAGLFKQGYNSYSNADGQIIKSIAAIRELHQMCLTSMGPCGRNKIIVNHLGKIIITNDAATMLRELDIVHPAVKVLVMATEQQKIDMGDGTNLVMILAGELLNVSEKLISMGLSAVEIIQGYNMARKFTLKELDEMVVGEITDKNDKNELLKMIKPVISSKKYGSEDILSELVSEAVSHVLPVAQQAGEIPYFNVDSIRVVKIMGGSLSNSTVIKGMVFNREPEGHVKSLSEDKKHKVAVFTCPLDIANTETKGTVLLHNAQEMLDFSKGEEKQIDAMMKEIADMGVECIVAGAGVGELALHYLNRYGILVLKVPSKFELRRLCRVCGATPLPRLGAPTPEELGLVETVKTMEIGGDRVTVFKQEQGEISRTSTIILRGATQNNLDDIERAIDDGVAAVKGLMKPSGGKLLPGAGATEIELISRITKYGERTPGLLQLAIKQFAVAFEVVPRTLAETAGLDVNEVLPNLYAAHNVTEPGAVKTDHLYKGVDIDGESDEGVKDIREENIYDMLATKKFAINVATEAATTVLSIDQIIMAKKAGGPRAPQGPRPGNWDQED

Entity 8 Entity 8 polymer

Description description	T-complex protein 1 subunit zeta
Molecular weight formula_weight	59997.6 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	z,Z

MSLQLLNPKAESLRRDAALKVNVTSAEGLQSVLETNLGPKGTLKMLVDGAGNIKLTKDGKVLLTEMQIQSPTAVLIARAAAAQDEITGDGTTTVVCLVGELLRQAHRFIQEGVHPRIITDGFEIARKESMKFLDEFKISKTNLSNDREFLLQVARSSLLTKVDADLTEVLTPIVTDAVLSVYDAQADNLDLHMVEIMQMQHLSPKDTTFIKGLVLDHGGRHPDMPTRVKNAYVLILNVSLEYEKTEVNSGFFYSSADQRDKLAASERKFVDAKLKKIIDLKNEVCGMDPDKGFVIINQKGIDPMSLDVFAKHNILALRRAKRRNMERLQLVTGGEAQNSVEDLSPQILGFSGLVYQETIGEEKFTYVTENTDPKSCTILIKGSTHYALAQTKDAVRDGLRAVANVLKDKNIIPGAGAFYIALSRYLRSANMNKLGAKGKTKTGIEAFAEALLVIPKTLVKNSGFDPLDVLAMVEDELDDAQDSDETRYVGVDLNIGDSCDPTIEGIWDSYRVLRNAITGATGIASNLLLCDELLRAGRSTLKETPQ

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Unit-cell length a length_a	1.000 Å
Unit-cell length b length_b	1.000 Å
Unit-cell length c length_c	1.000 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	—

Space group space_group	P 1
Space-group number int_tables_number	1
Crystal system crystal_system	—

Resolution resolution	3.60 Å
Resolution测定Method resolution_method	—
颗粒数 num_particles	290160

TRiC-ATP-AlFx

1. Protein Identity and Related Structures Protein Identity & Related Structures

T-complex protein 1 subunit alpha

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

T-complex protein 1 subunit beta

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

T-complex protein 1 subunit delta

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

T-complex protein 1 subunit epsilon

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

T-complex protein 1 subunit gamma

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

T-complex protein 1 subunit eta

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

T-complex protein 1 subunit theta

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

T-complex protein 1 subunit zeta

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

9csa__assembly_1__model_1

9csa__assembly_1__model_1 | I(q)

9csa__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

冷冻电镜 EM 3D

5. Entities and Polymers Entities & Polymers (8)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer