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hynac5 and hynac4 show complementary expression patterns. hynac5 is expressed at the oral site of the tentacle bases (A) and in early bud (C), whereas hynac4 is expressed at the aboral site of the tentacles (B); it also lacks any expression in early bud stages. Arrows indicate the different expression zones of both genes; primary magnifications are 20× (A–C).
