Rodriguez-Bello A, Kah O, Tramu G, Conlon J M
U.D.I Biologia Celular, Universidad de La Laguna, Tenerife, Spain.
Peptides. 1993 Sep-Oct;14(5):1055-8. doi: 10.1016/0196-9781(93)90086-v.
The gastrointestinal neurohormones of reptiles have been poorly characterized structurally. Neurotensin has been purified to apparent homogeneity from an extract of the small intestine of the alligator, Alligator mississipiensis. The primary structure of the peptide (pGlu-Leu-His-Val-Asn-Lys-Ala-Arg-Arg-Pro-Tyr-Ile-Leu) is identical to that of chicken neurotensin. The data provide further evidence for a close phylogenetic relationship between crocodilians and birds.
爬行动物的胃肠神经激素在结构上的特征一直不太明确。神经降压素已从密西西比短吻鳄小肠提取物中纯化至明显的均一性。该肽的一级结构（焦谷氨酸-亮氨酸-组氨酸-缬氨酸-天冬酰胺-赖氨酸-丙氨酸-精氨酸-精氨酸-脯氨酸-酪氨酸-异亮氨酸-亮氨酸）与鸡神经降压素相同。这些数据为鳄鱼和鸟类之间密切的系统发育关系提供了进一步的证据。
