Armengol J A, Prada F, Quesada A, Génis-Gálvez J M
Experientia. 1984 Oct 15;40(10):1149-51. doi: 10.1007/BF01971467.
The presence of dense core vesicles in the terminal expansions of photoreceptors in development is described in the chick embryo retina, from the 16th to the 18th day of incubation.