L-cysteine acts as a major source of sulfur in cell culture. Cysteine has been used in pulse-chase experiments to study protein expression from an inducible promoter. L-Cysteine is used to supplement cell culture media.
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McBean, G. J.; Flynn, J. Molecular mechanisms of cystine transport. Biochem. Soc. Trans. < span>2001, 29, ( Pt 6), 717-722.