(3) Cytoplasm. The cytoplasm is dark blue, granule-free, and limited to a
thin rim around the nucleus. There is no evidence of hemoglobin formation.
Figure 4-1b. Erythrocytes series: Prorubricyte.
Size. Ten to 15 microns in diameter.
(2) Nucleus. The nucleus is generally round, dark purple, am smaller than
the nucleus of the rubriblast. The chromatin is coarse am clumped giving the nucleus a
darker stain. Nucleoli are usually not present, but when they are, they appear more
prominent than in the rubriblast.
(3) Cytoplasm. The cytoplasm is royal blue and more radiant than in the
rubriblast. Cytoplasmic granules are not present.
Figure 4-1c. Erythrocytes series: Rubricyte.
Size. Eight to 14 microns in diameter.