PF4 GI:4505733 platelet factor 4 (chemokine (C-X-C motif) ligand 4) 1 mssaagfcas rpgllflgll llplvvafas aeaeedgdlq clcvkttsqv 50 51 rprhitslev ikagphcpta qliatlkngr kicldlqapl ykkiikklle 100 101 s