Structural Classification Of Proteins 7 CLASSES ( a, b, a/b, a+b.) 800 FOLDS same secondary structure elements same order, same connectivity domain structures 1.294 SUPERFAMILIES possible evolutionary relationship 2. 327 FAMILIES strong sequence homology 54.745 DOMAINSStructural Classification Of Proteins 7 CLASSES (a,b,a/b,a+b…) 800 FOLDS same secondary structure elements, same order, same connectivity domain structures 1,294 SUPERFAMILIES possible evolutionary relationship 2,327 FAMILIES strong sequence homology 54,745 DOMAINS