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a–d, Apical view of 48 h.p.f. Platynereis with expression in dorso-medial brain (green, acTub; red, microRNAs). e, Apical view of 72 h.p.f. Platynereis brain section showing colocalization of microRNA (red) with serotonin (cyan) (blue, DAPI, green, acTub). f, g, Apical views of 5 d.p.f. Platynereis brain. h, 3D reconstruction of 5 d.p.f. apical brain with superficial expression at the base of antennae.
