They allowed the radiolabelled phages to infect unlabelled bacteria , and then centrifuged to separate material remaining outside the bacterial cells .
Hershey and Chase labelled either the phage DNA using radioactive phosphorus - 32 or the protein using radioactive sulphur - 35 .
Hershey allowed the radiolabelled phages to infect unlabelled bacteria , and then centrifuged to separate material remaining outside the bacterial cells .
Hershey and Chase labelled either the phage DNA using radioactive phosphorus - 32 or the protein using radioactive sulphur - 35 .