ACCORDING TO THE DEPOSITOR, THEY OBSERVED THE MODIFICATION ON CYS59 WITH EXTENDED DENSITY MAP, AND ...ACCORDING TO THE DEPOSITOR, THEY OBSERVED THE MODIFICATION ON CYS59 WITH EXTENDED DENSITY MAP, AND INTERPRET THIS CYS59 AS CYS-S-O, THE SULFENIC ACID IN THIS ENTRY. HYDROGEN PEROXIDE CONSIST OF HOH A 900 AND 901 DONATED OXYGEN OF CYS-S-O. SINCE IT WAS KIND OF LIKE AN INTERMEDIATE, THE DISTANCE OF S-O IS LARGER THAN IT USUALLY IS.