title: Resistance to urea as a genetic marker of some animal and human viruses.
mesh_terms: D004352:Drug Resistance, Microbial; D005823:Genetics; D008967:Molecular Biology; D009522:Newcastle disease virus; D017955:Poliovirus; D011212:Poxviridae; D014508:Urea / Q000494:pharmacology*; D014780:Viruses / Q000187:drug effects
chemical_list: D014508:Urea