Assertion: red blood cell | /r/HasAspect | nucleus
Facets:
value: in comparison
type: OTHER
value: during early phases of erythropoiesis
type: TEMPORAL
Source sentences:
text: Mature red blood cells of birds have a nucleus, however in the blood of adult females of penguinenucleated red blood cells () have been observed, but with very low frequency.
text: Red blood cells have no nucleus and
text: They do have nuclei during early phases of erythropoiesis, but extrude them during development as they mature; this provides more space for hemoglobin.
text: In comparison, the red blood cells of other vertebrates have nuclei; the only known exceptions are salamanders of the genus Batrachoseps and fish of the genus Maurolicus.