“…Evidence that particular minor components of collagen are involved in cross-links between side chains has been obtained (carbohydrate, Hormann, 1960;Oneson & Zacharias, 1960; €-amino group of lysine, Levy, Fishman 8r Cabrera, 1960;Betheil & Gallop, 1960;Franzblau, Seifter & Gallop, 1961 -4 beginning has been made by Loewi, Glynn & Dorling (1960) in the chemical identification of ' collastin'.…”