For the specific digestion of proteins prior to mass spectrometric analyses and further applications in protein research. Endoprotease, cleaves carboxyterminally at the position of the aromatic amino acids phenylalanine, tyrosine and tryptophan. Can also be used in combination with other proteases. For the specific digestion of proteins prior to mass spectrometric analyses and further applications in protein research. Endoprotease, cleaves carboxyterminally at the position of the aromatic amino acids phenylalanine, tyrosine and tryptophan. Can also be used in combination with other proteases.