Click on the blue button to choose the mass spectrometry data of rhEPO expressed in CHO and E.coli. There are three graphs:

The one on the left shows the total mass of the molecule detected. The peaks in this graph correspond to the molecular mass of that particular protein.

The top right graph shows the overview of the peptide sequence. The peaks in this graph represent one amino acid in the peptide sequence.

The bottom right graph shows the magnification of the peptide sequence shown in the top graph.

The peaks in this graph represent one amino acid in the peptide sequence. Notice that the diagram of glycan marks the site of glycosylation