Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2ztdA 2ztdB 3ze3E 3ze3F 2ztdA 100 98 0 14 2ztdB 98 100 0 14 3ze3E 31 32 100 94 3ze3F 0 0 94 100 FOLD SIMILARITY (Z-SCORE) 2ztdA 2ztdB 3ze3E 3ze3F 2ztdA 30.7 27.9 1.5 1.5 2ztdB 27.9 29.1 1.6 1.6 3ze3E 1.6 1.5 15.8 13 3ze3F 0 0 13 17