Assertion: bone marrow's blood cell | /r/HasProperty | red
Facets:
Source sentences:
text: It is soft and flexible, and it serves to produce red blood cells and store fat.
text: Most blood cells are red blood cells.
text: Red bone marrow produces red blood cells and is found in bones of the skull, pelvis, spine, ribs, sternum, shoulder blades, and in the long bones of the arms and legs.
text: As a whole, bone marrow is a complex tissue comprised of red and white blood cells, their precursors, and a group of cells consisting of fibroblasts, reticulocytes, adipocytes, and endothelial cells which formulate a connective tissue network called "stroma".