Abstract
Limbal stem cell deficiency results from the loss of tissue regenerating stem and progenitor cells. Corneal epithelial regeneration is maintained by stem and progenitor cells which reside in the schlerocorneal limbus. They possess stem cell characteristics and can be stimulated to proliferate by external signals. The limbus is the stem cell niche for corneal epithelial stem cells and forms a unique microenvironment in which stem cell characteristics are conserved. Regulation of limbal epithelial stem cells is produced by a network of signals within the niche which governs cell fate decisions with regards to proliferation, differentiation or maintenance of a quiescent status.
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