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teloblasts

[teloblast]

Teloblasts are unusually large (50-400μm) embryonic stem cells in annelid and leech species (for example Helobdella triserialis, Helobdella robusta, Theromyzon tessulatum, Theromyzon trizonare, Chaetopterus, Tubifex tubifex) that develop from stem cell precursors (proteloblasts). In leech embryos, segments arise sequentially from five pairs of teloblasts that undergo iterated divisions to generate columns (bandlets) of segmental founder cells (primary blast cells), which in turn generate segmentally iterated sets of definitive progeny. The five bilateral pairs of stem cells on each side of the embryo are being referred to as M teloblasts (mesodermal), and four types (ectoteloblasts ... ... ... ... ... Subscribe to continue reading! ... ...

 

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