Proerythroblast

Proerythroblast
Proerythroblast (Image courtesy of Melih Aktan M.D.)

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Overview

A proerythroblast (or rubriblast, or pronormoblast) is the earliest of four stages in development of the normoblast.

Laboratory findings

In histology, it is very difficult to distinguish it from the other "blast" cells (lymphoblast, myeloblast, monoblast, and megakaryoblast.) The cytoplasm is blue in an H&E stain, indicating that it is basophilic.

"Pronormoblast" vs. "proerythroblast"

Some sources consider the terms "pronormoblast" and "proerythroblast" to be synonyms. However, other sources consider "proerythroblast" to be a parent term, divided into the following two categories:

• "pronormoblast" - normal develoment
• "promegaloblast" - abnormal development

Additional images

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  Blood cell lineage
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  Proerythroblasts
• 
  Proerythroblasts

External links

• Histology image: 01804loa – Histology Learning System at Boston University - "Bone Marrow and Hemopoiesis: bone marrow smear, erythroblast series with proerythroblast"
• Template:OklahomaHistology
• Histology at KUMC blood-blood04
• Image and description at purdue.edu
• Histology of "promegaloblast" at marist.edu (pernicious anemia)
• Interactive image at usuarios.lycos.es
• Overview at temple.edu

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