Production of virus by embryonic cultures co-cultivated with breast tumour cells or infected with milk from breast cancer patients.

Adenocarcinoma/microbiology Adult Aged Breast Breast Neoplasms/microbiology Cell Line Centrifugation, Density Gradient Embryo, Mammalian Female Humans Middle Aged Milk, Human/microbiology Nucleic Acid Hybridization Oncogenic Viruses/enzymology,growth & development,isolation & purification,metabolism Pregnancy RNA Viruses/enzymology,growth & development,isolation & purification,metabolism RNA, Viral/analysis,biosynthesis RNA-Directed DNA Polymerase/analysis Tritium Uridine/metabolism

RNA, Viral Tritium RNA-Directed DNA Polymerase Uridine