2l2k B -1.00 BS01 rna A 0 P43 K46 N47 M50 E54 S70 H71 F75 R91 N92 K93 K94 K97 P1 K4 N5 M8 E12 S28 H29 F33 R49 N50 K51 K52 K55 3.5.4.37 Kd=370nM Q91ZS8 20946981 1 ~ 42 PSGKNPVMILNELRPGLKYDFLSESGESHAKSFVMSVVVDGQFFEGSGRNKKLAKARAAQSALATVFNLHL