Transgenic organism One into which a cloned genetic material has been experimentally transferred, a subset of these foreign gene express themselves in their offspring. A code in which a given amino acid is specified by a set of three nucleotides. Tumor A mass of excess tissue. Tumor markers Substances found in abnormal amounts in the blood, in other body fluids, or in tumor tissue of some patients with certain types of cancer. Invisible rays that are part of the energy that comes from the sun.
Ultraviolet radiation can burn the skin and cause skin cancer.
Skin specialists recommend that people use sunscreens that block both kinds of radiation. Vector A self-replicating DNA molecule that transfers a DNA segment between host cells. A noncellular biological entity that can reproduce only within a host cell. Inside the infected cell, the virus uses the synthetic capability of the host to produce progeny virus. White blood cells Cells that help the body fight infection and disease.