title: The rct40 and T50 markers and the characteristics of some variants of measles virus.
mesh_terms: D002498:Centrifugation; D006801:Humans; D008459:Measles virus / Q000302:isolation & purification* / Q000472:pathogenicity*; D017955:Poliovirus / Q000302:isolation & purification / Q000472:pathogenicity; D013696:Temperature; D014774:Virulence; D014776:Virus Cultivation