Today, scientists and doctors are in the process of preparing another new set of mpas of the human anatomy. But this is a very unique set of maps. In recent years, new developments in imagining technology, such as CAT (Computerized axial tomography) scans, PET (positron emission tomography) scans, and MRIs (magnetic resonance imagining), have given the medical profession new ways to look inside human beings. But what researchers are now trying to unravel is infinitely more ambitious. They are trying to decode the molecular arrangement of the chromosomes in the reproductive cells of the human body. This molecular arrangement is known as the human genome. It is the blueprint for all the physical and behavioral traits that an individual can pass on to his or her offspring. It is the code for building a human being.