Jaagsiekte sheep retrovirusPulmonary Adenomatosis, OvineBetaretrovirusSheepHyaluronoglucosaminidaseEndogenous RetrovirusesSheep DiseasesGene Products, envCell Transformation, ViralGoatsTerminal Repeat SequencesReceptors, VirusGPI-Linked ProteinsViral Envelope ProteinsLung NeoplasmsAdenocarcinoma, Bronchiolo-AlveolarCell LineDNA, ViralLung