Who was the scientist that found out the letters of DNA?

Question: Who was the scientist that found out the letters of DNA?
- Keywords:
  discovery,
  DNA,
  scientist
Asked by to Judith, Gemma on 6 Jan 2019. This question was also asked by .
- Judith Sleeman answered on 6 Jan 2019:
  
  Had to google that one: apparently it was a german biochemist called Albrecht Kossel. He won the Nobel prize in 1910. Always more to learn!

Question: Who was the scientist that found out the letters of DNA?