(haf sis'tēn),
Cysteine with the proton lost from the sulfur.
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It is also possible to produce half-cystine residues for disulfide cross-links by placing the half-cystine residues in the correct primary sequence, and then adjusting the length of the bisulfide bond between these residues.
Concentrations of half-cystine, lysine, ornithine, and arginine in AF (Fig.