MITOCHONDRIAL DNA; NUCLEAR DNA; EVERYONE KNOWS ABOUT IT; ONLY THIRTY-SEVEN GENES; 20-25,000 GENES; IN THE MITOCHONDRIA, WHICH WOULD BE COOL SINCE IT'S THE POWERHOUSE OF THE CELL AND ALL BUT WAS MADE WEIRD BY THAT ONE BOOK THAT MADELIENE L'ENGLE WROTE. IN THE NUCLEUS, WHICH IS PRETTY MUCH THE BRAIN OF THE CELL; NOBODY EVEN LEARNS ABOUT IT IN MIDDLE SCHOOL; SIGNIFICANT TO TISSUE GROWTH