Reinharz A C, Pavel S, Vallotton M B
Experientia. 1978 Sep 15;34(9):1232-3. doi: 10.1007/BF01922977.
Cultured pineal ependymal cells from rat fetuses release into their incubation media immunoreactive neurophysin. The presence of neurophysin was assessed by radioimmunoassay. The culture medium was found to contain 440 pg neurophysin per mg protein.