“…Intermediate filaments: 14,15,and 19 Basal epithelial cells marked by the acidic cytokeratins KRT5 and 14 have been shown to mark progenitor cells of numerous epithelial tissues including skin, cornea, developing trachea, lung airway epithelia, bladder, and salivary glands (Colopy, Bjorling, Mulligan, & Bushman, Olfactory epithelium-gives rise to microvillar cells and Bowman's gland (Yoshida et al, 2001;Weng et al 2016) Olfactory epithelium-Ascl3-deficient mouse lacks the non-neuronal microvillar and Bowman's gland support cells (Weng et al 2016) KIT SG-duct cells (adult reported; Emmerson et al, 2018). SG-Kit-deficient E14 SG (Kit w/w ) has reduced epithelial branching ) Olfactory epithelium (Goss et al 2015) Lymphatics (Stanczuk et al 2015) Kidney-reductions in ureteric bud branching and nephrons (Kit w/w and via inhibition of c-kit tyrosine phosphorylation; (Ito et al 2005;Wang et al, 2011;Morris et al 2004) No Krt15-deficient studies reported KRT19 SG-not reported SG-No Krt19-deficient SG studies reported Exocrine pancreas, liver-duct cells (Means et al, 2008) Stomach, intestine (Means et al, 2008) No Krt19-deficient studies reported…”