IHC of embryonic zebrafish hearts for quantification of cardiomyocytes was performed as previously described38 (link). Primary antibodies used were: Amhc (Atrial myosin heavy chain; University of Iowa Developmental Studies Hybridoma Bank) and Living Colors® polyclonal anti-DsRed antibody (Clontech). Secondary antibodies used were anti-mouse IgG1-FITC (Southern Biotech) and anti-rabbit IgG-TRITC (Southern Biotech). A Zeiss M2BioV_12 Stereo microscope was used to image hearts. Additional antibody information is included in Supplementary Table 2.
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