CCL21 GI:4506835 small inducible cytokine A21 precursor 1 maqslalsll ilvlafgipr tqgsdggaqd cclkysqrki pakvvrsyrk 50 51 qepslgcsip ailflprkrs qaelcadpke lwvqqlmqhl dktpspqkpa 100 101 qgcrkdrgas ktgkkgkgsk gckrtersqt pkgp