Regulation of Cell Cycle Length in Progenitor Cells of the Developing Vertebrate Retina

Progenitor cells exist in two distinct phases during development with different forms of division: preneurogenic and neurogenic. Preneurogenic progenitor cells produce two cells that divide again while neurogenic progenitor cells divide to produce one or both cells that withdraw from the mitotic cycle and differentiate. Preneurogenic and neurogenic cells are fundamentall