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Fig. 1 Overlapping and distinct expression of tbx2a and tbx2b during zebrafish development. A Schematic representation of tbx2a and tbx2b expression in the zebrafish heart at 24 and 48 hpf, and other sites of co-expression, such as the retina and pronephros. Green is used to indicate tbx2a expression, purple represents tbx2b expression, and orange indicates co-expression. The blue and red indicate the inflow and outflow tracts associated with the heart at the labeled stage of cardiac development. Label AVC marks the coexpressed domain. Labels G (glomerulus), DE (distal early), and DL (distal late) mark pronephric subdomains