Abstract
A 10‐day old sea urchin larva (Strongylocentrotus purpuratus) expands the left coelomic pouch (red) to form future adult precursor tissues, including the germ line. A germ‐line marker, Vasa (red), which is initially expressed in every blastomere of the sea urchin during early embryogenesis (see Yajima and Wessel, this issue), is retained in multipotent cell lineages during late larval development (DNA, cyan). This image shows a lateral view from the left side of the larva.
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