YFLW6 LIV12 GA13 G15 VIAL20 KR35 EDK53 IVLA65 EDKQ85 HYF137 DENS139 LIV140 NDS144 ILVF145 LFMIV146 LIV155 DEN157 FYL158 G159 YFW180 P183 ED184 DEN196 WYF198 G201 LMIVF207 RK257 # found 27 key residues