passages.id: split_8_test_1010_passage
passages.type: progene_text
passages.text: By the end of the first WR-2721 infusion ( prior to mesna infusion ) , the mean cysteine level more than doubled and the mean Cys-SS-LMW ( cystine and the mixed LMW disulfides ) level decreased by approximately 50 % in both plasma and blood cells .