Abstract
Publisher Summary This chapter summarizes findings that reveal a phenomenologically rich developmental cell biology in the A, B, and C quadrants in embryos of glossiphoniid leeches, such as Helobdella robusta (class Hirudinea; phylum Annelida). In glossiphoniid leeches, these non-D quadrants are precursors of definitive endoderm among other tissues. To appreciate the roles of these cells in embryogenesis, however, it is necessary first to summarize glossiphoniid leech development in terms of the contributions of the D quadrant.
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