“…Conversion of the sulfur contents of an amembraneous sperm nucleus into a measure of the protamine content requires that we know the relative proportion of the protamines present in the nucleus and the amino acid sequences of the protamines. Amino acid sequences for the protamines present in bull, stallion, chinchilla, hamster, human, and mouse sperm have been previously reported (Balhorn et al, 1977(Balhorn et al, , 1988Bellve and Carraway, 1978;Pogany et al, 1981;Mazrimas et al, 1986;Corzett et al, 1987Corzett et al, , 1999Balhorn, 1989;Pirhonnen, 1994;Bench et al, 1996). Likewise, the proportion of the different forms of protamine present in bull, stallion, hamster, mouse, and human sperm nuclei have been previously reported (Pogany et al, 1981;Balhorn, 1989;Pirhonnen, 1994;Bench et al, 1996;Corzett et al, 1999).…”