cysteine, l-cysteine, cys, c, proteinogenic amino acid molecule. structural chemical formula.

acid additive amino atomic atoms background biochemistry biology biotech bond carbon chemical chemistry composition compound cys cystein cysteine cystine disulfide e920 educational essential feather food formula gene genetics hair hydrogen illustration line maillard medicine model molecular molecule natural nitrogen nutrition oxygen paracetamol peptide protein proteinogenic skeletal structure sulfur supplement thiol