Interrelation of Methionine, Choline, Betaine and Arsenocholine in the Chick

Abstract
Betaine (glycine betaine) and methionine are capable of assuming a certain portion of the functions of choline in the chick. Arsenocholine is capable of assuming the remainder of the choline functions. The effects of betaine (or methionine) and arsenocholine are additive, and, together, are practically a complete substitute for choline under the conditions of these experiments.