Beta-keratin localization in developing alligator scales and feathers in relation to the development and evolution of feathers.

Beta-keratins form large part of the corneous material of scales and feathers. The present immunocytochemical study describes the fine distribution of scale- and feather-keratins (beta-keratins) in embryonic scales of the alligator and in avian embryonic feathers. In embryonic scales of the alligator both scale-keratin and feather-keratin can be immunolocalized, especially in the subperiderm layer. No immunolabeling for feather keratin is...