4qqb X 2.8 BS01 rna P 0 K13 L15 H16 S17 Y18 F20 R29 F31 H33 R59 K13 L15 H16 S17 Y18 F20 R29 F31 H33 R59 ? 0003676 Kd=1.24nM B7Z0E2 25209665 4 ~ 20 GAMATRETGIIEKLLHSYGFIQCCERQARLFFHFSQFSGNIDHLKIGDPVEFEMTYDRRTGKPIASQVSKIA