1. b.16.1 Ecotin, trypsin inhibitor Ecotin, trypsin inhibitor sandwich; 8 strands in 2 sheets; complex topology with the crossing loops 1id5 d1id5i_ I:35-48,52-64,69-83,93-99,114-121 1xx9 d1xx9c_ C:35-49,52-64,69-84,92-99,114-121 1xxf d1xxfc_ C:35-49,52-64,69-84,92-99,114-121