_ stats: contacts=5 Nring=2 specif=0.40 _ PDBs: 1:6wc2_D,2:1hbx_A, _ -lnE: 1:10.9,2:8.8, _ 1 2 0001 R* RTRA 0013 R RC-- 0016 Q --YA 0017 V VC-- 0021 K* KGKG