In 1952, Alfred Hershey and Martha Chase confirmed that the genetic material of the bacteriophage, the virus which infects bacteria, is made up of DNA (see Hershey–Chase experiment).
Godine 1952, Alfred Herši i Marta Čejs su potvrdili da se genetički materijal bakteriofaga, virusa koji inficiraju bakterije, sastoji od DNK (pogledajte Herši-Čejsov eksperiment).