Pronormoblast (also known as Proerythroblast / Rubriblast) is the first microscopically recognizable cell in erythrocyte lineage.
- 1% of Nucleated Cells in BM.
- Peripheral Blood: 0%
- 1% of Nucleated Cells in BM.
- Size: 20-25 μm
- Nucleus: Round to slightly oval
- High N/C ratio (8:1)
- 1-3 faint nucleoli
- Fine chromatin
- Cytoplasm: Dark blue; may have prominent Golgi
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