Bone marrow is capable of regeneration. Bone marrow is the soft tissue in the cavity of the bone marrow, which is divided into red marrow, which is mainly composed of hematopoietic stem cells, and yellow marrow, which is mainly adipose tissue. The proportion of red marrow and yellow marrow changes with age, with red marrow at birth and yellow marrow gradually increasing thereafter. In adulthood, the red marrow accounts for only half of the bone marrow and is located mainly in the epiphyses of the flat and long bones. In case of severe blood loss, the yellow marrow can be transformed into red marrow. Hematopoietic cells in the bone marrow can not only differentiate into blood cells of different lineages, but also have the ability of self-renewal, so as to maintain a certain size of the stem cell pool and sustained hematopoietic capacity. Therefore, bone marrow can be regenerated. For more information, please consult a hematologist.