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Embryos depleted of their small micromeres develop and metamorphose normally. (A) Before (top) and after (bottom) small micromeres (smms) are removed by a needle. (B,C) Smm-removed pluteus larva formed coelomic pouches (arrows), as did normal larvae. (D-F) Smm-removed larvae formed adult rudiments (arrows) after 4-6 weeks and metamorphosed normally after 6 weeks of fertilization. Scale bars: 100 μm.
