All pharmacological treatments were performed as described previously (López-Schier and Hudspeth, 2006 (link); Wibowo et al., 2011 (link); Pinto-Teixeira et al., 2015 (link)). Briefly, the following concentrations and timings used were: Neomycin sulfate (Sigma, St. Louis, MO) 250 µM for 45 min; N-[N-(3,5-difluorophenacetyl)-L-alanyl]-S-phenylglycine-t-butyl ester (DAPT) (Sigma) 100 µM for 24–48 hr. Equal amounts of DMSO were diluted in embryo medium for control specimens.
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