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Polycomb mutant embryos show a weak spread of LacZ expression, but allow Gal4 to activate LacZ transcription throughout the embryo. All panels show in situ hybridizations to LacZ RNA in germ band retracted embryos. (A to D) Enhancer trap patterns in Polycomb zygotic null embryos containing the p[bx], p[iab-4], p[Mcp], and p[Abd-B] insertions, respectively. (E to H) Gal4 activation of LacZ transcription in Polycomb zygotic null embryos.
