Karyotype characterization and nucleolar organizer regions of marsupial species (Didelphidae) from areas of Cerrado and Atlantic Forest in Brazil - Pereira, Núbia P; Ventura, Karen; Silva Junior, Magno C; Silva, Daniela de Melo e; Yonenaga-Yassuda, Yatiyo; Pellegrino, Katia Cristina Machado (Genetics and Molecular Biology, 2008)