Thymus: Its Role in Lymphoid Recovery after Irradiation

Abstract
Immunological tolerance toward three synthetic random copolymers of the α-amino acids, glutamic, lysine, alanine, and tyrosine, was produced by a single injection of the polymers into newborn rabbits. The tolerant state could be extended by an additional intravenous injection of antigen. Repeated injections of the polymer in adjuvant mixture could "break" the tolerant state.