Assertion: immune system's part | /r/HasProperty | the bone marrow
Facets:
Source sentences:
text: Other parts of the immune system include the bone marrow, where white blood cells are produced; lymph nodes, which produce and store infection-fighting cells throughout the body; and the spleen, which helps control the amount of blood in the body and cleans out old or damaged blood cells from the body.
text: The primary parts of the immune system include the bone marrow and thymus.