| 1GM8: reference: Penicillin acylase has a single-amino-acid catalytic centre., Duggleby HJ, Tolley SP, Hill CP, Dodson EJ, Dodson G, Moody PC, Nature. 1995 Jan 19;373(6511):264-8. PMID: 7816145 |
This OCA 
Structure page
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(documentation).