Vethamany-Globus S, Globus M, Milton G
J Exp Zool. 1983 Sep;227(3):475-9. doi: 10.1002/jez.1402270317.
The mean plasma level of beta-endorphin in the newt, Notophthalmus viridescens, as measured by radioimmunoassay, is significantly higher than the circulating levels of beta-endorphin in the anuran, Rana pipiens, and in mammals (humans and mice). The newt beta-endorphin level is found to be 6-fold greater than mammalian levels and three times greater than the levels observed in Rana pipiens. The high levels are maintained in the newt throughout limb regeneration.
通过放射免疫测定法测得，蝾螈（绿红东美螈）体内β-内啡肽的平均血浆水平显著高于蛙类（豹蛙）以及哺乳动物（人类和小鼠）体内β-内啡肽的循环水平。研究发现，蝾螈体内β-内啡肽水平比哺乳动物体内水平高6倍，比豹蛙体内观察到的水平高三倍。在蝾螈肢体再生的整个过程中，其体内β-内啡肽水平一直维持在较高水平。
