... Argentinas 435 (14 05),Buenos Aires, ArgentinaFax: +5 411 5238 75 01 Tel: +5 411 5238 7500E-mail: ialgranati@leloir.org.ar(Received 24 November 2005, accepted 12 December 2005)doi :10 .11 11/ j .17 42-4658.2005.05098.xWe ... putrescine, as a result of the absence of ornithine and arginine decarboxylases (ODC and ADC) [7 10 ], which catalyse the first steps of bothpossible pathways of putrescine biosynthesis [11 ]. Inaccordance ... 9, 11 and 13 show the PCR products obtained using the primer pair T7 and RIB. Lanes 2, 4, 6, 8, 10 , 12 and 14 showthe PCR products obtained using the primer pair T7 and ADC2. Lane 15 , 1 kb DNA...