Figure 1. Comparison of red blood cells from sheep, human, and expired blood bank blood.

(A and B) Sheep red blood cells (A) are smaller in size compared to human red cells (B). (C) Human red blood cells after >45 days of storage in the blood bank demonstrate significant formation of echinocytes, spherical spiculated cells, that are distinctly different from the biconcave disk of normal red cells. All panels are shown with the same scale as indicated in (C).