1. b.47.1 Trypsin-like serine proteases Trypsin-like serine proteases barrel, closed; n=6, S=8; greek-key ! duplication: consists of two domains of the same fold 1bt7 d1bt7a_ A:40-49,122-127,131-139,149-161,162-172
2k1q A:40-49,122-127,131-139,148-159,165-171 3pp9 A:26-36,132-140,142-153,154-161,174-182