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Metabolism: clinical and experimental • 1983 | View Paper
“Besides being maximally active at pH4.7, these cartilage enzymes are enhanced in activity by cysteine and inhibited by arginine analogues, iodoacetamide, chloroquine and mercuric chloride.”
“ Chloroquine was also shown to inhibit the reduction of ferricyanide by cysteine , and to bind to certain sulfhydryl groups of human serum protein when present in concentrations found in patients taking the compound for rheumatoid arthritis.”