TABLE 2.

Essential amino acids in bovine casein and human milk

Source	Amino acid (mg/g protein)
	His	Ile	Leu	Lys	SAA			AAA	Thr	Trp	Val
					Total	Met	Cys
Bovine casein [32]	26	90	51	75	28	25	3	100	41	13	61
Human milk [33]	23	51	94	63	35	14	21	87	43	18	50
Ratio casein:human milk	1.13	1.76	0.541	1.19	0.801	1.78	0.141	1.15	0.951	0.721	1.22

Abbreviations: AAA, total aromatic amino acid; Cys, cysteine; His, histidine; Ile, isoleucine; Leu, leucine; Lys, lysine; Met, methionine; SAA, total sulfur-containing amino acids; Thr, threonine; Trp, tryptophan; Val, valine.

¹Numbers show the essential amino acids that are lower on an mg/g protein basis in casein than in human milk.