title: Progenitor-cell populations can be infected by RNA tumor viruses, but transformation is dependent on the expression of specific differentiated functions.
mesh_terms: D001354:Avian Leukosis Virus; D009189:Avian Myeloblastosis Virus; D002454:Cell Differentiation; D002472:Cell Transformation, Viral; D005121:Extremities / Q000196:embryology; D008264:Macrophages / Q000382:microbiology; D012192:Retroviridae Infections / Q000473:pathology*; D015017:Yolk Sac / Q000166:cytology / Q000382:microbiology