A comparative analysis of European and American eel (Anguilla anguilla and Anguilla rostrata) genomic DNA: 5S rDNA polymorphism permits the distinction between the two populations - NIEDDU, MARIELLA; SALVADORI, SUSANNA; DEIANA, ANNA MARIA; PICHIRI, GIUSEPPINA; CONI, PIERPAOLO; MEZZANOTTE R. (1998)