cysteine article 80 priority journal 60 nonhuman 52 controlled study 46 Cysteine 40 Humans 40 human 38 metabolism 34 unclassified drug 34 chemistry 28 oxidation reduction reaction 26 protein function 24 Oxidation-Reduction 22 Animals 20 genetics 20 male 20 Kinetics 18 molecular dynamics 18 human cell 16 protein analysis 16 protein structure 16 Male 14 amino acid sequence 14 arginine 14 disulfide bond 14 enzyme activity 14 protein aggregation 14 protein conformation 14 protein expression 14