Structural features of residue 223 in chain L NZ 7568 PRO L 223 CD 7583 -0.008 INTRA-CHAIN PRO L 223 CD 7583 LYS L 224 NZ 7592 -0.016 INTRA-CHAIN PRO L 223 CD 7583 LEU K 397 CD2 5894 -0.054 INTER-CHAIN