Fig. 2. GATA4 and GATA6 are under FGF control and overexpress BM proteins. (A) Effect of the dnFgfr mutation on Fgf, Fgfr and GATA factor expression; data from a DNA microarray experiment. Units are kDa. (B) GATA6 or GATA4 greatly enhances synthesis of laminin 1 and collagen IV even in dnFgfr and Lamc1 mutant ES cells (western blot).