The results of Avery et al. 's experiments were at first skeptically received by the scientific community and it was not until the development of genetic markers and the discovery of other methods of genetic transfer ( conjugation in 1947 and transduction in 1953 ) by Joshua Lederberg that Avery 's experiments were accepted .
Not until the discovery of other methods of genetic transfer ( conjugation in 1947 and transduction in 1953 ) by Joshua Lederberg were Avery 's experiments accepted .