In order to investigate if Activin A modifies such parameters, NPC growing with 10 ng/ml FGF2 were treated with 3 ng/ml Activin A. We also stimulated proliferating NPC with 0.5 ng/ml TGF-β1 or with 5 ng/ml BMP4, because their effects are well-described [19], [20], [21], [22], [23], [24], [25]. Here, TGFB1 is linked to nasopharyngeal carcinoma.