Protein sequence analysis: automated microsequencing.

The automated microsequencing of proteins can now be carried out at the 5- to 10-picomoles (submicrogram) level on polypeptides obtained directly from one- and two-dimensional gel electrophoresis. The techniques are applicable to polypeptides ranging in size from small peptides (less than 10 residues) to large proteins (more than 1000 residues).