Twenty years ago the main method for determining the amino acid sequence of a protein involved the use of a chemical method called the Edman degradation. In modern times this has been mainly replaced by the application of ...

DNA sequencing

Mass spectrometry

Explanation:

In the modern days, the DNA sequencing is done using, DNA sequencing

Mass spectrometry.

In the previous times, the amino acids were merged by using the traditional method of Edman degradation.

But now,

Mass Spectrometry and DNA sequencing is adapted by the scientist.

The sequencing by mass spectrometry is very fast and is of very high resolution.