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Ectopic PHA-4 specifies pharyngeal identity. Embryos expressing full-length pha-4 (D–F) or pha-4 missing the DBD (A–C; DBD−) under control of the heat shock promoter, were stained with the pharyngeal muscle antibody 3NB12 (A,D; pm), the pharyngeal marginal cell antibody αIF (B,E; pmc), or anti-LIN-26 ectodermal antisera (C,F; Labouesse et al. 1996).
