Before revision: Yet due to advancements in the synthesis of oligonucleootides and liquid chromatography, the production time needed for DNA fragments has greatly decreased.Recombinant human insulin was first approved for clinical trials in 1980.
After revision: Yet due to advancements in the synthesis of oligonucleotides and liquid chromatography, the production time needed for DNA fragments has greatly decreased.Recombinant human insulin was first approved for clinical trials in 1980.