Evolution of the TGF-beta Signaling Pathway and Its Potential Role in the Ctenophore, Mnemiopsis leidyi

Figure. 1 Early TGF-b mRNA expression

Four of the TGF-beta genes are detected early in development prior to and during gastrulation. The schematic at the top depicts the stages of embryos during cleavage and gastrulation, at 1–2 and 3 hours post fertilization (hpf), respectively. Embryos are lateral views, otherwise oral/aboral as stated. The asterisk marks the position of the blastopore.

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