The essential cells of the hemopoietic microenvironment.
D000273:Adipose Tissue / Q000166:cytology; D001854:Bone Marrow Cells; D002450:Cell Communication; D002454:Cell Differentiation; D002478:Cells, Cultured; D006410:Hematopoiesis; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D006801:Humans; D008264:Macrophages / Q000502:physiology