english: Through Oswald Avery’s study of Pneumococcus bacteria (1943), and Alfred Hershey and Martha Chase (publication 1953) with T2 bacteriophage virus, did people know that DNA is a genetic material.
non_english: Liwat panlitèn Oswald Avery marang bakteri Pneumococcus (1943), sarta Alfred Hershey lan Martha Chase (publikasi 1953) karo virus bakteriofag T2, wong lagi ngerti yèn DNA iku bahan genetik.