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Embryonic origins of oral and atrial siphon muscles. (A) Schematic diagram of 110-cell stage embryo, tailbud embryo and larva, with the A7.6 pair of blastomeres, and their derivatives, shown in brown. The B7.5 pair of blastomeres are shown in orange. The TVCs are shown in green; the ASMs are shown in blue. (B) Schematic lineage tree of the ontogeny of the B7.5 lineage based on Satou et al. (2004), Stolfi et al. (2010), Wang et al. (2013) and Razy-Krajka et al. (2014).
