Fig. 3
RARαb1 deficient embryos have increased expression of RA signaling responsive genes.
(A) qPCR for RA signaling responsive gene expression at the 8 s stage. (B, C) ISH for hoxb5b expression at the 8 s stage. Bracket indicates length of expression in the LPM. Views are dorsal with anterior up. (D, E) ISH for cyp26a1 expression at the 8 s stage. Arrows in E indicate increased expression in the tailbud and spinal cord. Views are lateral with anterior up and dorsal right. (F–H) Fronto-lateral views of Tg(-5.1myl7:GFP)f2 embryos at 48 hpf of control sibling, RARαb1 deficient embryos, and RARαb1+Hoxb5b deficient embryos. (I–K) Hearts from control sibling, RARαb1 deficient embryos and RARαb1+Hoxb5b deficient Tg(-5.1myl7:DsRed-NLS)f2 embryos. Images are frontal views. Red indicates ventricle. Green indicates atrium. (L) Percentage of control+rarαb1 MOs (n = 60), hoxb5b+rarαb1 MOs (n = 68) showing enlarged and normal hearts. (M) qPCR for CM differentiation gene expression at 48 hpf. (N) Mean CM number at 48 hpf.