Zeng, Y., Li, Y., Yuan, R., Zuo, D., Zheng, X., Xiao, W., Fang, M., Lin, B., Cao, C., Cheng, X., Wang, N., Yang, T., Luo, W., Chen, W. (2026). Biallelic loss-of-function mutations in BPNT1 cause vitamin B12–dependent megaloblastic anemia. Blood. https://doi.org/10.1182/blood.2026033550