proerythroblast

Production of Hb continues in the cell throughout its early development from the proerythroblast to the reticulocyte in the bone marrow.

Pronormoblast, also commonly called Proerythroblast or Rubriblast.

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

"Pronormoblast" vs. "proerythroblast"

During in vitro erythropoesis, LW appears at either the erythroid colony forming stage or later at the proerythroblast stage.