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GATA4 is expressed in the developing semilunar valves. (A-H) Immunohistochemistry identifies GATA4 expression in the aortic (A,B,E,F) and pulmonic (C,D,G,H) valve at E13.5 (A-D) and E18.5 (E-H) of wild-type embryos. B,D,F and H are high magnification images of A,C,E and G, respectively. Scale bars: 100 μm.
