4rcm B 1.8 BS01 rna E 0 K161 S163 H167 W177 S178 T180 W231 Y237 D274 K20 S22 H26 W36 S37 T39 W90 Y96 D133 ? 0003723 Kd=22uM Q06390 26318451 3 AAIIPPWLNIPENSRFFVIKSSSLKHVKRSFYNGIWSSTHFGNKRLSEAYKKLNSGAKVFLFFSINTSGRFCGVAEMVSDLKMDLDTSIWEDEQKYGKAFKVRWVIVRDINNRSLKRFLIPSNEMKPITHSRDTQEIPYSIGISIINLFKTQDIFSFLD