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La L-carnitine est principalement stocke dans les tissus musculaires

CYSTEINE IN BIOLOGICALLY ACTIVE OLIGOPEPTIDES AND PROTEINS Except for the structural properties of proteins, cysteine residues may also play important role in catalytic processes of enzymes, in storage and adjusting the reduction potentials, they can be a source of sulfur assimilable in easy way, etc

Caporaso JG, Lauber CL, Walters WA et al (2012) Ultra-high-throughput microbial community analysis on the Illumina HiSeq and MiSeq platforms

Sci Rep 11 , 17598 (2021)

In 1967 Steiner showed that insulin was synthesised from a precursor protein, called proinsulin