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A growth factor is something in the body that allows or deny cells to grow. These factors are normally made up of cell hormones or other proteins within the body.[1] All growth factors occur naturally within cells and are necessary for the cell life progression and death. History[change | change source] The first growth factor discovered and publicly recognized was in 1986. It was recognized in the form of a Nobel Prize. The award was given to Rita Levi-Montalcini and Stanley Cohen. [2] References[change | change source] ↑ "Growth Factor". Biology Online. Archived from the original on 2012-03-11. Retrieved 2013-03-12. ↑ "The Nobel Prize in Physiology or Medicine 1986". The Nobel Foundation. This short article about biology