Which of the following is an example of a stem cell niche?
A niche is defined as a local microenvironment that physically anchors, sustains, and instructively controls stem cell behavior through contact, paracrine signals, and extracellular matrix mechanics. Classic examples include basal layer of interfollicular epidermis where hemidesmosomes attach basal keratinocyte stem cells to laminin-rich basement membrane, and adjacent dermal fibroblasts provide Wnt and BMP inhibition to prevent differentiation. Other prototypes are bone marrow endosteal niche, intestinal crypt base, and Drosophila cap cells. Trophoblast, erythrocytes, and mature neurons are d
Ref: Scadden, Nature 2006; Fuchs et al., Cell 2004; Gilbert, Chapter 6: Niche definition skin basal layer example.
