Resumen de Teeth. (Cover story)
The article discusses the evolution of teeth. Paleontologists hypothesize that external denticles, which are toothlike nubs made of dentine and collagen, of some early vertebrates migrated into the jaw, grew, and gained previously unknown functions that eventually gave rise to modern teeth. Topics include fossil and genetic evidence suggesting teeth originated inside the body, the embryonic development and evolution of teeth, and the difficulty recreating evolution in a laboratory.
