1B1Z:
reference: Structural basis for the recognition of superantigen streptococcal pyrogenic exotoxin A (SpeA1) by MHC class II molecules and T-cell receptors., Papageorgiou AC, Collins CM, Gutman DM, Kline JB, O'Brien SM, Tranter HS, Acharya KR, EMBO J 1999 Jan 4;18(1):9-21. PMID: 9878045

This OCA Structure page
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