CEL and chronic myelogenous leukemia, BCR-ABL1 positive: In healthy Japanese subjects, a major fraction of about 90% of circulating free CML and CEL was found to be present in erythrocytes at mean concentrations of 0.9 μM and 0.2 μM (CML-to-CEL molar ratio, 4.5), respectively, as measured by LC–MS/MS (Nomi et al. 2020).