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Description
Some of the most widely used are: Methionine as a precursor of cysteine

Many peptides can maintain activity for many years

Pearson AS, Spitz FR, Swisher SG , Kataoka M, Sarkiss MG, Meyn RE, McDonnell TJ, Cristiano RJ, Roth JA

Decker Inc, 139-145, 1998

Optional research biomarkers: senescence markers (p16^INK4a, SA--gal), SASP cytokine profile (IL-6, IL-1, MMPs) if lab resources permit