Mesoderm is not generally disturbed in elavl1a morphants. (A-N) Shown are representative embryos following in situ hybridization for myod, ntl, pax2a, and nkx2.5 at 5- or 15-somite stages in control or morphant embryos, as indicated. Embryos are flat mounted, viewed dorsally, anterior to the left. For each representative sample, n > 20.