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Introduction.
http://www.cancer.gov/cancerinfo/pdq/genetics/colorectal
DNA/Genetic testing.
http://hopkins-gi.nts.jhu.edu/
Find out if your family's history of colon cancer indicates you might have a genetic link and what to consider when it comes to genetic testing.
http://www.mayoclinic.com/health/colon-cancer/HQ00448