How are human red blood cells different from frog red blood cells?

1) Human red blood cells do not have a nucleus; frog red blood cells are nuclear.
2) Human red blood cells are in the form of a biconcave disc, and the frog erythrocytes are oval.
3) Human red blood cells with a diameter of 7-8 microns, frog red blood cells 15-20 microns in length and about 10 microns in width and thickness.

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