Source:http://linkedlifedata.com/resource/umls/id/C0038738
MSH: Chemical agents that react with SH groups. This is a chemically diverse group that is used for a variety of purposes. Among these are enzyme inhibition, enzyme reactivation or protection, and labelling.,CSP: compounds which interact with disulfide bonds and sulfhydryl groups in proteins to either favor or inhibit the formation of disulfide crosslinks; usually means a reducing agent which inhibits disulfide formation.