CXCR4 GI:4503175 chemokine (C-X-C motif) receptor 4 isoform b 1 megisiytsd nyteemgsgd ydsmkepcfr eenanfnkif lptiysiifl 50 51 tgivgnglvi lvmgyqkklr smtdkyrlhl svadllfvit lpfwavdava 100 101 nwyfgnflck avhviytvnl yssvlilafi sldrylaivh atnsqrprkl 150 151 laekvvyvgv wipallltip dfifanvsea ddryicdrfy pndlwvvvfq 200 201 fqhimvglil pgivilscyc iiisklshsk ghqkrkalkt tvililaffa 250 251 cwlpyyigis idsfilleii kqgcefentv hkwisiteal affhcclnpi 300 301 lyaflgakfk tsaqhaltsv srgsslkils kgkrgghssv stesesssfh 350 351 ss