Development of retinal vessels. II. Earliest stages of vessel formation.
D000818:Animals; D001485:Basement Membrane; D002196:Capillaries / Q000196:embryology; D002454:Cell Differentiation; D008854:Microscopy, Electron; D009900:Optic Nerve / Q000098:blood supply / Q000166:cytology; D051381:Rats; D012171:Retinal Vessels / Q000166:cytology / Q000196:embryology*