Roles of the serotonin synthesis emzyme, TphD2, in body patterning

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I found the following facts with zebrafish embryos. 1. Inhibitors of tryptophan hydroxylase or the antidepressant, Prozac, affected convergence during the body patterning. 2. A serotonin transporter, serta, which is the target for Prozac, is expressed during gastrulation. 3. Gastrula embryos produced serotonin. Based on the findings, I conclude that serotonin is involved in regulation of convergence movements during body patterning.