TY - GEN AU - Wray,G A AU - McClay,D R TI - The origin of spicule-forming cells in a 'primitive' sea urchin (Eucidaris tribuloides) which appears to lack primary mesenchyme cells SN - 0950-1991 PY - 1989///0324 KW - Animals KW - Fluorescent Antibody Technique KW - Gastrula KW - ultrastructure KW - Gene Expression Regulation KW - Mesoderm KW - Microscopy, Electron KW - Sea Urchins KW - embryology N1 - Publication Type: Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S UR - https://doi.org/10.1242/dev.103.2.305 ER -