DNA (deoxyribonucleic acid) is the genomic material in cells that contains the genetic information used in the development and functioning of all known living organisms. DNA, along with RNA and proteins, is one of the three major macromolecules that are essential for life.
A doctor of osteopathic medicine (D.O.) is a fully trained and licensed doctor who has attended and graduated from a U.S. osteopathic medical school. A doctor of medicine (M.D.) has attended and graduated from a conventional (allopathic) medical school. The major difference between osteopathic and allopathic doctors is that some osteopathic doctors provide manual medicine therapies, such as spinal manipulation or massage therapy, as part of their treatment. After medical school, both M.D.s and D.O.s must complete residency training in their chosen specialties.
Doctor of Osteopathy- It means that they are trained to look at the body a little bit different than a regular MD. go to wikipedia and type in Medical schools, there is a pretty good explanation of the difference there. By the way, they are not one step below MDs they are just as well trained, and work side by side.