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Immunofluorescence analysis of Lbx1 expression in ES cell-derived cardiomyocytes. (a′,b′) Sarcomeric α-actinin- (blue)-stained cardiac myocytes coexpressed Lbx1 (green) and (a′′) GATA 4 (red) or (b′′) Nkx2.5 (red). (a′′′,b′′′) Merged images. Bar = 20 μm.
