1. Andrew, A. (1974), Further evidence that enterochromaffin cells are not derived from the neural crest. J. Embryol. Exp. Morph., 31, 589–98.
2. Andrew, A. (1975), APUD cells in the endocrine pancreas and the intestine of chick embryos. Gen. Comp. Endocrinology, 26, 485–95.
3. Andrew, A. (1976), An experimental investigation into the possible neural crest origin of pancreatic APUD (islet) cells. J. Embryol. Exp. Morph., 35, 577–93.
4. Azzopardi, A. and Thurlbeck, W.M. (1968), Oxidative enzyme pattern of the bronchial mucous glands. Am. Rev. Resp. Dis., 97, 1038–45.
5. Becker, K.L., Monaghan, K.G. and Silva, O.L. (1980), Immunocytochemical localization of calcitonin in Kulchitsky cells of human lung. Arch. Pathol. Lab. Med., 104, 196–8.