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Ref : 013042-85 - © Gérard PEAUCELLIER - ISM Sea urchin (Paracentrotus lividus) embryo development at the prism stage, seen of profile. The prism stage is the first larval stage of the embryo. Here, the secondary mesenchyme cells and the tip of the developing archenteron (gut, left) can be seen. LM, DIC. |