In 1928, Frederick Griffith in his experiment discovered that traits of the "smooth" form of Pneumococcus could be transferred to the "rough" form of the same bacteria by mixing killed "smooth" bacteria with the live "rough" form.
I 1928 opdagede Frederick Griffith i sit eksperiment, at træk fra den "glatte" form for Pneumococcus kunne overføres til den "ru" form af den samme bakterie ved at blande dræbte "glatte" bakterier med levende "ru" former.