ALA 19 * LYS 20 * ILE 21 * PRO 22 * ARG 24 * GLY 86 * TYR 87 * ASP 88 * CYS 89 * PRO 90 * GLY 127 * TRP 128 * HIS 129 * HIS 130 * ALA 131 * ALA 136 * SER 137 * GLY 138 * PHE 139 * CYS 140 * TYR 141 * TYR 161 * ASP 163 * LEU 164 * ASP 165 * LEU 166 * HIS 167 * HIS 168 * GLY 169 * ASP 170 * GLY 171 * SER 186 * LEU 187 * HIS 188 * LYS 189 * GLY 193 * PHE 194 * PHE 195 * PRO 196 * GLY 197 * GLN 250 * LEU 251 * GLY 252 * ALA 253 * ASP 254 * THR 255 * ASP 259 * PRO 260 * MET 261 * CYS 262 * SER 263 * GLY 289 * GLY 290 * GLY 291 * GLY 292 * TYR 293 *