Encyclopediarhesus factor:rhesus factor: see Rh factor. The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved. More on rhesus factor from Fact Monster:
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- Blood Types - Blood Types Human blood is grouped into four types: A, B, AB, and O. Each letter refers to a kind ...
- Encyclopedia: Anatomy and Physiology - Encyclopeadia articles concerning Anatomy and Physiology.
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