_ stats: contacts=5 Nring=3 specif=0.60 _ PDBs: 1:6pe2_B,2:1o4x_A, _ -lnE: 1:8.1,2:7.7, _ 1 2 0043 I* --VA 0047 N* --NA 0050 M* YCQA 0051 K FA-- 0054 K KCRT