MODRES 1YPV SCH A   43  CYS  S-METHYL-THIO-CYSTEINE                             
MODRES 1YPV CME A  180  CYS  S,S-(2-HYDROXYETHYL)THIOCYSTEINE                   
MODRES 1YPV CME A  195  CYS  S,S-(2-HYDROXYETHYL)THIOCYSTEINE                   
MODRES 1YPV CME A  199  CYS  S,S-(2-HYDROXYETHYL)THIOCYSTEINE