Fig. 4
Fig. 4
Expression of hey2 in CPCs during cardiac development. (A-L?) Double RNA in situ hybridization analysis of hey2 (A,B,D-F,H-J,L,L?) and Tg(epicon21:EGFP) expression (C,G,K) as compared with nkx2.5 (A,H,H?), myl7 (C-E,G,I,K-L?) and mef2cb (B,F,J) in wild-type embryos at 16.5?hpf (A-D), 20?hpf (E-H?) and 24?hpf (I-L?). The arrowheads in D',E-G indicate hey2+ cells outside of the cardiac (myl7+) region. (M-N?) Immunofluorescence showing Tg(epicon21:EGFP) enhancer expression when compared with Tg(nkx2.5:ZsYellow) at 20?hpf (M-M?) and Tg(myl7:mCherry-RAS) at 24?hpf (N-N?). (O) Schematic representation of hey2 and myl7 progenitor localization and movement patterns from 16.5 to 24?hpf. Scale bars: 50?µm. Asterisk labels pharyngeal mesoderm. Arrows indicate the atrium (N-N?) and arrowheads mark the ventricle (I-L?,N-N?).