1. Alberts B, Bray D, Lewis J, Raff M, Roberts K, Watson JD (1989) Molecular biology of the cell, 2nd edn. Garland, New York
2. Assan R, Boillot J (1973) Pancreatic glucagon and glucagonlike material in tissues and plasma from human fetuses 6–26 weeks old. Pathol Biol 21:149–155
3. Bauer GE (1988) Islets of Langerhans. In: Weiss L (ed) A textbook of histology, 6th edn. Urban and Schwarzenberg, Baltimore, pp 738–749
4. Bryson JM, Tuch BE, Baxter RC (1989) Production of insulinlike growth factor-II by human fetal pancreas in culture. J Endocrinol 121:367–373
5. De Giorgio R, Sternini C, Brecha NC, Widdison AL, Karanjia ND, Reber HA, Go VLW (1992) Pattern of innervation of vasoactive intestinal polypeptide, neuropeptide Y, and gastrin-releasing peptide immunoreactive nerves in the feline pancreas. Pancreas 7:376–384