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Table 3 Amino acid content of human hair protein performed by amino acid analysis of hydrolyzed proteins

From: Hair for brain trade-off, a metabolic bypass for encephalization

Amino acidsa

Median and range within studies

g/100 g hair

Cysteine + methionine + cysteic acidb

17 (8 –18.7)

Phenylalanine + tyrosine

4 (1.7 – 5.7)

Arginine

6.5 (2.5 – 9.3).

  1. aSee detailed data in the Table 7.
  2. bIn the mature hair cysteine is partially oxidized into cysteic acid.