How many human interferons are there?
D002499:Centrifugation, Density Gradient; D005796:Genes; D006801:Humans; D007370:Interferon Type I / Q000235:genetics; D007372:Interferons / Q000032:analysis / Q000145:classification*; D008970:Molecular Weight; D012333:RNA, Messenger / Q000235:genetics
D007370:Interferon Type I; D012333:RNA, Messenger; D007372:Interferons