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equine erythrocytes

The "stacking" of erythrocytes seen in the equine blood is normal in equine blood smears. Note the pale centers of the erythrocytes...what accounts for this central pallor? Notice that it is more prominent in the canine blood smear below.

What is responsible for the acidophilia of the erythrocyte cytoplasm? What is it's function?

canine erythrocytes