Resumen
Células animais normais, não infectadas, apresentam uma característica única; a presença em seu genoma de genes (provirus) idênticos ou estritamente relacionados a retrovirus exógenos infecciosos. O nível de expressão destes genes varia de indivíduo para indivíduo: do silêncio completo até a produção de partículas virais, Proteínas de vírus endógenos e exógenos foram purificadas a partir de vírus sonicados e passados em coluna de Sepharose 6B saturada com GuHCI 6M. A presença de equivalentes dos antígenos p27 e p 19 foi analisada por radioimunoensaio. A presença de componentes de vírus endógenos foi investigada em CEF, coração, cérebro, músculo de asa e músculo de coxa de galinha, codorna e marreco. A função ou significado destas proteínas é desconhecida. Fatores ambientais, hormonais e imunológicos necessitam ser estudados.
Citas
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