Virtual colonoscopy: a CT scan image of the colon that will not require the use of an endoscope. Flexible sigmoidoscopy: using a lighted scope, the procedure allows a physician to see inside the sigmoid colon and rectum Abraham said having a traditional colonoscopy is ideal because it allows the physician to view the entire colon and it is both diagnostic and therapeutic. For instance, a barium enema or a virtual colonoscopy could miss small polyps. Based on the ACP, most adults should obtain screened for cancer of the colon beginning at age 50. People with a family group history of colon cancer and others regarded as high-risk should obtain screened beginning at age 40, or a decade younger compared to the age of when your youngest family member was diagnosed with cancer of the colon.Their results come in the Proceedings of the National Academy of Sciences , PNAS Early Edition week of March 2, 2009. Managing cellular connections The experts enabled cells to respond with additional cells in a managed way by covering the cell areas with DNA . First they induced the cells expressing artificial sugars bearing particular chemical groupings. Lengths of artificial DNA, introduced in to the cell-growth moderate, were equipped to identify these artificial sugars on the cell areas and chemically bind to them. The researchers covered cell surfaces in one group with strands of single-stranded DNA only 20 bases long, and the areas of another group with the complementary DNA strand.