1. Andrew A. Further evidence that enterochromaffin cells are not derived from the neural crest. J Embryol Exp Morphol 1974;31:589–598.
2. LeDouarin NM. The embryological origin of the endocrine cells associated with the digestive tract: experimental analysis based on the use of a stable cell marking technique. In: Bloom SR, editor. Gut hormones. Edinburgh: Churchill Livingstone; 1978. p. 49–56.
3. Pictet RL, Rall LB, Phelps P, Rutter WJ. The neural crest and the origin of the insulin-producing and other gastrointestinal hormone-producing cells. Science 1976;191:191–192.
4. Mori M, Matsukuma A, Adachi Y, Miyagahara T, Matsuda H, Kuwano H, et al. Small cell carcinoma of the esophagus. Cancer 1989;63:564–573.
5. Fukuda T, Ohnishi Y, Nishimaki T, Ohtani H, Tachikawa S. Early gastric cancer of the small cell type. Am J Gastroenterol 1988;83:1176–1179.