Source: http://www.ests.um5.ac.ma/cours/Dipl%C3%B4me%20Universitaire%20de%20Technologie/G%C3%A9nie%20Bio-Industriel/Semestre%2002/Biologie%20mol%C3%A9culaire/GBI1%20Biologie%20Moleculaire%20Pr%20EL%20%20%20JALIL.pdf