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...f cells ([[stem cells]]) from the [[bone marrow]], [[blood]], or umbilical cord to treat a variety of medical conditions. These procedures have the potenti ==Stem cells==

...tion that occurs when hair follicles become plugged with oil and dead skin cells, leading to whiteheads, blackheads, or pimples. ...- The part of the immune system that is composed of specialized, systemic cells and processes that eliminate pathogens or prevent their growth.

...which human blood is classified, based on proteins occurring on red blood cells; the four classification groups are A, AB, B, and O * [[Abortion]] - termination of a pregnancy; can occur because of natural causes (called a miscarriage) or be a medical intervention