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In embryos of the oligochaete annelid Tubifex, most ectodermal tissues are derived from four bilateral pairs of embryonic stem cells called teloblasts (ectoteloblasts N, O, P and Q). Ectoteloblasts are generated on both left and right sides of the embryo through an invariable sequence of cell divisions of a proteloblast, NOPQ, and they are positioned in a mirror symmetric pattern relative to the embryonic...
Ectodermal teloblastogenesis in the oligochaete annelid Tubifex is a spatiotemporally regulated process that gives rise to four bilateral pairs of ectoteloblasts (N, O, P, and Q) that assume distinct fates. Ectoteloblasts on either side of the embryo arise from an invariable sequence of asymmetric cell divisions of a proteloblast, NOPQ, which occur with a defined orientation with respect to the embryonic...
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