title: A comparison of beta-endorphin levels in regenerating and nonregenerating vertebrates.
abstract: 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.
mesh_terms: D000818:Animals; D004723:Endorphins / Q000097:blood*; D005260:Female; D006801:Humans; D008297:Male; D051379:Mice; D011863:Radioimmunoassay; D011894:Rana pipiens; D012038:Regeneration; D012455:Salamandridae; D013045:Species Specificity; D014714:Vertebrates / Q000097:blood* / Q000502:physiology; D001615:beta-Endorphin
chemical_list: D004723:Endorphins; D001615:beta-Endorphin