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miR-31 is expressed ubiquitously during early development of the sea urchin. Embryos of different developmental stages were labeled by FISH using an LNA probe specific to the mature miR-31 sequence or a scrambled-miR control and counterstained with Hoechst. (A) miR-31 is expressed ubiquitously in the sea urchin embryo. (B) There is a notable decrease in the intensity of miR-31 staining in miR-31 KD blastulae (24 hpf). Scale bar: 50 µm.
