Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3s3tA 4x01A 5griA 3s3tA 100 0 50 4x01A 0 100 0 5griA 43 0 100 FOLD SIMILARITY (Z-SCORE) 3s3tA 4x01A 5griA 3s3tA 30.4 0 1.9 4x01A 0 6.8 0 5griA 0.4 0 56.3