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Endosymbiosis or Endosymbiosis theory, is the process by which a new organism originates from the fusion of two existing organisms, or, more precisely, by which two independently organisms become a tightly coupled system and eventually just one organism.[1] Scientists have conjectured that the mitochondrion, chloroplast and centrioles may be examples of endosymbiosis due to each containing DNA independent of the cell's nucleus.[2]


  1. http://www.gpc.edu/~pgore/students/w96/joshbond/symb.htm
  2. http://www.nature.com/nrm/journal/v8/n6/fig_tab/nrm2180_F4.html