hemopoiesis haemopoiesis GO:0030097 blood cell biosynthesis The process whose specific outcome is the progression of the myeloid and lymphoid derived organ/tissue systems of the blood and other parts of the body over time, from formation to the mature structure. The site of hemopoiesis is variable during development, but occurs primarily in bone marrow or kidney in many adult vertebrates. biological_process Wikipedia:Haematopoiesis hematopoiesis blood cell formation hematopoietic or lymphoid organ development