from cells of secretory glands, e.g. parotid gland, salivary glands, sweat glands, lacrymal glands

Full Title

Differentiation of animal cells from one lineage to another; Differentiation of pluripotent cells > from epidermal cells, from skin cells, from oral mucosa cells > from cells of secretory glands, e.g. parotid gland, salivary glands, sweat glands, lacrymal glands