Unusual development of basement membrane about small blood vessels.
D000818:Animals; D001001:Anura; D001485:Basement Membrane; D001808:Blood Vessels / Q000033:anatomy & histology*; D002196:Capillaries / Q000166:cytology*; D003239:Connective Tissue Cells; D066298:In Vitro Techniques; D008854:Microscopy, Electron