The nucleolus, virus infection, and trisomy in man.
D002455:Cell Division; D002466:Cell Nucleolus; D002875:Chromosomes; D004314:Down Syndrome / Q000209:etiology*; D004812:Epidemiologic Methods; D005260:Female; D006507:Hepatovirus; D006801:Humans; D010063:Ovum / Q000502:physiology*