ARG1 and chronic myelogenous leukemia, BCR-ABL1 positive: In all patients the Arg1 plasma levels, ranging from 35–316 ng/ml (Figure 1D), were higher than reported normal median levels (9.56±4.03 ng/mL to 21.9±9.2 [26], [27], [28]).The CML cell line K562, but not the cell lines BV-173 or CML-T1, expressed Arg1 mRNA (Figure 1E).