part of this activity was due to molecules that resemble a mitogen first isolated from platelets and known as platelet-derived growth factor ( pdgf ) , since these cells released pdgf measured in a radioreceptor assay ( 355 +/- 117 pg per milliliter per 48 hours ; n = 6 ) and since anti-pdgf antibody neutralized 38 +/- 7 percent of this mitogenic activity ( range , 13 to 60 percent ; n = 6 carotid-plaque isolates ) .
C0018284
mitogen
C0032200
pdgf