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Preliminary remarks on NOR location in a Sicilian population of Lebias fasciata (Teleostei, Cyprinodontidae)

Abstract A preliminary study on nucleolus organizer region polymorphism was carried out in a Sicilian population of Lebias fasciata using several staining techniques (Ag‐staining, CMA3‐staining, and FISH). Intrapopulation polymorphism of the number and size of the rDNA loci was found. A maximum of six NORs was found, involving four chromosome pairs both in homozygotic and het‐erozygotic conditions. Duplication of NORs was also detected.