Researchers have discovered that the largest source of the fuel that cancer cells use to proliferate is amino acids which make up proteins and not glucose as earlier believed. Cancer cells are notorious for their ability to divide uncontrollably and generate hordes of new tumor cells. The new findings could offer a novel way to look at cancer cell metabolism a field of research that scientists hope will yield new drugs that cut off cancer cells' ability to grow and divide. If you want to successfully target cancer metabolism you need to understand something about how different pathways are being