Abstract
Bone marrow transplantation, which is also known as stem cell transplantation, is often used to treat different types of diseases that are related to the hematopoietic system, in order to recover the full function of the bone marrow. Stem cells can be found at the umbilical cord blood level and in the placenta, from where they will be extracted and cryopreserved in banks, where they will be stored until the patient needs them. The CD34 + antigen has a high relationship with hematopoietic stem cells, which will be expressed in the initial phases of blood differentiation. Its relationship with hematopoietic progenitor cells and its scope to reach the bone marrow, after bone marrow transplantation; It can be determined that a CD34 + antigen count can give an overview of how the post-transplant process is taking place.

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