Hill C R, Kissun R D, Weiss J B, Garner A
Experientia. 1983 Jun 15;39(6):583-5. doi: 10.1007/BF01971107.
Vitreous from patients with proliferative diabetic retinopathy contains an angiogenic substance which stimulates the proliferation of blood vessels on the chick chorioallantoic membrane, whereas vitreous from non-diabetics who do not have a proliferative retinopathy does not.