Ultrastructure of growth cones formed by isolated rat adrenal medullary chromaffin cells in vitro after treatment with nerve growth factor.

Growth cones formed by adrenal chromaffin cells from young postnatal rats cultured in the presence of nerve growth factor (NGF) were studied at an electron microscopic level. These growth cones are similar in many respects to those formed by sympathetic neurons in vitro supporting the view that NGF-treated chromaffin cells may undergo neuronal transdifferentiation.