Signaling through Il6r regulates HSC development under the normal vasculogenesis.a Std, Il6r, and Il6 morphants were interrogated by WISH for kdrl, efnb2a, and dlc at 28 hpf. Black arrowheads denote the vascular lines. b Qualitative phenotype distribution of embryos from a scored with medium, high (up), and low (down) expression of these markers. Medium, white bar; high, red bar; low, gray bar. c Maximum projections of the DA region of fli1a:eGFP embryos at 30 hpf injected with Std, Il6r, and Il6 MOs and assayed for immunohistochemistry for GFP (green) and TUNEL (red). Scale bar represents 200 μm. d Embryos from the same experiment as in c were subjected to WISH for runx1 expression at 30 hpf. Black arrowheads denote HSCs in the floor of the DA region. e Qualitative phenotype distribution of embryos from d scored as in b
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