Assertion: red blood cell | /r/CapableOf | lack nucleus
Facets:
Source sentences:
text: Mature red blood cells are unique among cells in the human body in that they lack a nucleus (although erythroblasts do have a nucleus).
text: It is covered with a membrane composed of lipids and proteins, lacks a nucleus, and contains hemoglobin—a red iron-rich protein that binds oxygen.
text: For example, red blood cells (erythrocytes), which lack a nucleus, live for approximately 120 days in the bloodstream.