• In the choroid of three cynomolgus monkeys (Macaca irus) and of one baboon (Papio anubis) lymphatic capillaries were demonstrated by transmission electron microscopy.
Wolf Krebs, Ingeborg P. Krebs. Ultrastructural Evidence for Lymphatic Capillaries in the Primate Choroid. Arch Ophthalmol. 1988;106(11):1615–1616. doi:10.1001/archopht.1988.01060140783055
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