Every day, the bone marrow generates billions of new blood cells. This process, known as hematopoiesis, consists of a series of stages by which hematopoietic stem cells produce red blood cells, macrophages, lymphocytes, etc. The MYC gene and the mechanisms that regulate its expression play a major role in these various stages, but they are also involved in several types of leukemia as a result of the overexpression of MYC in blood cells. Scientists have revealed that hematopoiesis is regulated by a genomic region, distant from MYC, containing several enhancers.