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Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions.
Carcinoembryonic Antigen (CEA) is a protein found in embryonic tissues. After birth, detectable levels in the blood disappear. Consequently, It is normally not possible to detect CEA in the blood of a healthy person. If it appears in the blood it can indicate cancer, but it will not indicate which kind of cancer.