1. c.51.1 Class II aaRS ABD-related Anticodon-binding domain-like 3 layers: a/b/a; mixed beta-sheet of five strands, order 21345; strand 4 is antiparallel to the rest 1ggm d1ggmb1 B:385-390,400-406,439-451,453-459,477-483 1b76 d1b76b1 B:384-390,400-406,439-451,453-459,476-483