AlpharetrovirusErythroblastosis, FetalAvian LeukosisAvian leukosis virusFetusOncogene Proteins v-erbBOncogene Proteins v-erbAErythroblastsOncogenesCell Transformation, ViralChickensRetroviridae Proteins, OncogenicProto-Oncogene Protein c-ets-1Leukemia, Erythroblastic, AcuteLeukemia, ExperimentalSpleen Focus-Forming VirusesProto-Oncogene Protein c-ets-2Chick EmbryoGenes, ViralCampylobacter fetusRetroviridae ProteinsCell Transformation, NeoplasticFriend murine leukemia virusNucleic Acid HybridizationTritrichomonas foetusPregnancyOncogene Proteins, ViralBase SequenceFetal DiseasesGestational AgeUltrasonography, PrenatalReceptors, Thyroid HormoneViral ProteinsGenesProto-OncogenesFibroblastsReceptor, Epidermal Growth FactorTranscription, GeneticCell LineProtein-Tyrosine KinasesMutationCloning, MolecularMolecular WeightMaternal-Fetal ExchangeRNA, ViralFetal HeartDNA, ViralMolecular Sequence DataCells, CulturedTransfectionRNA, MessengerProto-Oncogene ProteinsPrenatal DiagnosisCell DifferentiationAmino Acid SequenceFetal Growth RetardationPlacentaPregnancy Trimester, SecondAbortion, VeterinaryHeart Rate, FetalSheepFetal DevelopmentFetal DeathEmbryonic and Fetal DevelopmentAmniotic FluidHydrops FetalisUmbilical ArteriesFetal WeightFetal HypoxiaTritrichomonasPregnancy Trimester, ThirdInfant, NewbornPregnancy Trimester, FirstFetal BloodCrown-Rump Length