Incorporation of Selenium-75 into Dog Hair

Abstract

Trace amounts of Se75 injected subcutaneously into dogs as either Se75O3 were deposited and retained in hair for as long as 316 days. Se75 was found in the cystine-rich protein keratin when the latter was isolated as the thiosulfate, S-sulfo-kerateine, and in the cystine fraction isolated from hair. The source of selenium which is incorporated into hair protein is discussed.