Table - link µmoles/gram hair
||Human Homo sapiens
||Robbins, Clarence R. Chemical composition, pp.39-68, chapter 2 in the book Chemical and physical behavior of human hair / Clarence R. Robbins.-2nd ed (2002) p.54 table 2-7
|| S Moore, DH Spackman, WH Stein - Chromatography of amino acids on sulfonated polystyrene resins. An improved system - Analytical Chemistry, vol 30 number 7 pp.1185-1190 1958 - ACS Publications,  Speakman, J.B. Meilland Textile Ber. 33, 823 (1952)  Hahnel R. [Comparative chemical studies on physiological and pathological keratins. I. Quantitative determination of N-terminal amino acids in the horny layer of callosity, psoriasis scales, nails and hair]. Arch Klin Exp Dermatol. 1959 209: 97-103PubMed ID14398859
||P.53 bottom paragraph: "Kerr and Godin [ref 79], using the dinitrophenylation method of Sanger [ref 80], have identified valine, threonine, glycine, alanine, serine, glutamic acid, and aspartic acid as N-terminal amino acids in human hair. Quantitative data by Speakman [primary source 64] and Hahnel [primary source 142] for N-terminal amino acids of human hair, using this same procedure, are summarized in Table 2-7."