we observed that vgvapg was chemotactic for fibroblasts and monocytes , with optimal activity at approximately 10 ( -8 ) m , and that the chemotactic activity of vgvapg was substantial ( half or greater ) relative to the maximum responses to other chemotactic factors such as platelet-derived growth factor for fibroblasts and formyl-methionyl-leucyl-phenylalanine for monocytes .
C0008013
chemotactic factors
C0027229
formyl-methionyl-leucyl-phenylalanine