SLC23A1 and acute lymphoblastic leukemia: Having confirmed expression of the main vitamin C (SLC23A1 and SLC23A2) and dehydroascorbic acid (DHA; GLUT1) transporters in each T-ALL cell line (SI Appendix, Fig. S3A), we blocked transport through SLC23A1, SLC23A2, and GLUTs with the inhibitor phloretin (39, 40).