Chain A ( W9 M10 A11 A12 G13 L14 M15 I16 G17 A18 G19 A20 C21 Y22 C23 V24 Y25 K26 L27 T28 I29 N120 V124 L127 S128 C130 L131 F132 Q134 G135 I198 N199 C202 V206 S207 C209 C210 N211 S212 F213 L214 Q215 Q216 A217 G218 L219 N220 L221 L222 I223 S224 M225 T226 V227 I228 N229 N230 L232 M277 L278 F279 S280 F281 M282 S283 L284 F285 I286 G289 )