Irina Grishina;Anne Fenton;Sumathi Sankaran-Walters; Gender Differences, Aging and Hormonal Status in Mucosal Injury and Repair Irina Grishina;Anne Fenton;Sumathi Sankaran-Walters; Department of Medical Microbiology and Immunology, University of CA, Davis, One Shields Ave, Davis, CA 95616, USA ; Figure 3. Collagen scaffold in small intestinal villus . Collagen is an important component of the connective tissue scaffold in the mucosa. Collagen I and III are demonstrated using histochemical staining in the jejunum Collagen: red null,null,5(2),160-169. Doi:10.14336/AD.2014.0500160