There , he was responsible for synthesizing short chains of DNA .
When Mullis developed the PCR in 1983 , he was working in Emeryville , California for Cetus Corporation , one of the first biotechnology companies .
There , Mullis was responsible for synthesizing short chains of DNA .
When Mullis developed the PCR in 1983 , he was working in Emeryville , California for Cetus Corporation , one of the first biotechnology companies .