The 18S rRNA from Odontophrynus americanus 2n and 4 (Amphibia, Anura) reveals unusual extra sequences in the variable region V2 - Alvares, Lúcia E; Wuyts, Jan; Van de Peer, Yves; Silva, Eduardo P; Coutinho, Luiz Lehmann; Brison, Olivier; Ruiz, Itamar R. G (Genome, 2004)