title: Bioassay of cell cultures containing a Type-II leukosis virus (JM strain).
mesh_terms: D000818:Animals; D001354:Avian Leukosis Virus / Q000302:isolation & purification*; D001681:Biological Assay; D002642:Chick Embryo; D002645:Chickens; D004372:Ducks; D014776:Virus Cultivation