Which stage is third in the RUBRI sequence?

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Multiple Choice

Which stage is third in the RUBRI sequence?

Explanation:
In erythroid maturation, red-cell precursors progress in a defined order: rubribast (rubriblast) → prorubricyte → rubricyte → metarubricyte, then enucleation to form a reticulocyte. The third stage is rubricyte, which comes after prorubricyte and before metarubricyte. At this stage, hemoglobin synthesis is actively increasing, the cytoplasm begins to take on a more eosinophilic color as Hb accumulates, and the nucleus remains but becomes more condensed in preparation for the next stage and eventual enucleation.

In erythroid maturation, red-cell precursors progress in a defined order: rubribast (rubriblast) → prorubricyte → rubricyte → metarubricyte, then enucleation to form a reticulocyte. The third stage is rubricyte, which comes after prorubricyte and before metarubricyte. At this stage, hemoglobin synthesis is actively increasing, the cytoplasm begins to take on a more eosinophilic color as Hb accumulates, and the nucleus remains but becomes more condensed in preparation for the next stage and eventual enucleation.

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