Figures 345-356 — Cells of the erythrocyte series found in the bone marrow of adult or nearly adult 



chickens. 2,470 X 



345 



346 



347 



348-349 



Large early erythroblast. A cell this large and 

 immature is relatively rare in adult bone mar- 

 row. Nucleolus occupies the right third of the 

 nucleus. 

 Erythroblast. 



Late erythroblast. This cell and the preceding 

 one are typical of the erythrocyte stem cells in 

 bone marrow. 



Early polychromatic erythrocytes. Both show 

 faint indications of their nucleoli at the lower 

 left of each nucleus. 



350, 351 

 352-354 



355 



356 



Mid-polychromatic erythrocytes. 



Late polychromatic erythrocytes. Each cell in 



the series is slightly more differentiated than the 



preceding one. 



Cell with full complement of hemoglobin as 



judged by the color and a fully differentiated 



nucleus but with a round shape. 



Normal mature erythrocyte. 



184 



