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Fig. 7 (a) 12–30 hpf phenotypes of bmpr1a+/-or -/- embryos with bmpr1b KD and acvr1l KD with or without ACVR1-R206H, with or without chordin (chd) mRNA or bmp7 mRNA. Four pooled experiments plus two experiments with controls only. Columns: 1, N = 172; 2, N = 160; 3, N = 106; 4, N = 135; 5, N = 104; 6, N = 121; 7, N = 169; 8, N = 117; 9, N = 32; 10, N = 91; 11, N = 17; 12, N = 57; 13, N = 29; 14, N = 28; 15, N = 49; 16, N = 49. (b–g) Representative dorsal view of pax2.1, krox20, and myod expression in 5–9 somite stage bmpr1a+/-or -/- embryos with bmpr1b KD, acvr1 KD, with or without ACVR1-R206H, and with or without chordin or bmp7 mRNA. Three experiments. Embryos are oriented with the anterior (A) side left and the posterior (P) side right. Number of embryos that showed expression patterns similar to the representative embryos out of the total number of embryos analyzed is shown. (b) bmpr1a +/- embryo (c) bmpr1a-/-embryo (d) bmpr1a-/-embryo with acvr1l and bmpr1b KD (Type I KD embryo) (e) Type I KD embryo injected with ACVR1-R206H and chd mRNA (f) Type I KD embryo injected with ACVR1-R206H mRNA (g) Type I KD embryo injected with ACVR1-R206H and bmp7 mRNA.