Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 2xrnA 2xrnB 5ccbA 2xrnA 100 99 88 2xrnB 99 100 90 5ccbA 88 90 100 FOLD SIMILARITY (Z-SCORE) 2xrnA 2xrnB 5ccbA 2xrnA 40.5 39.6 0 2xrnB 39.6 40.6 0 5ccbA 0 0 43.8