of the cytokines tested , which included interleukin-1 ( il-1 ) , interleukin-2 ( il-2 ) , interleukin-3 ( il-3 ) , interleukin-4 ( il-4 ) , interleukin-6 ( il-6 ) , interferon-alpha ( ifn-alpha ) , interferon-gamma ( ifn-gamma ) , transforming growth factor-alpha ( tgf-alpha ) , transforming growth factor-beta ( tgf-beta ) , platelet derived growth factor ( pdgf ) , and tumor necrosis factor-alpha ( tnf-alpha ) , only tnf-alpha and pdgf had demonstrable growth factor activity .
C0079189
cytokines
C0040690
transforming growth