Balestrazzi, A., Bernacchia, G., Pitto, L., Luccarini, G. and Carbonera, D. (2009) “Spatial expression of DNA topoisomerase I genes during cell proliferation in Daucus carota”, European Journal of Histochemistry, 45(1), pp. 31–8. doi: 10.4081/ejh.2001.1611.