Figure 3

Peptide sequences from the Mascot search results. A: CK 19 identified in a 39-kDa spot by 7 peptides (Matched peptides shown in bold red). It is most likely an endogenous protein although a contaminating protein cannot be excluded. B: Two peptides (24 amino acids) identify CK 3 from a spot focused around 28 kDa. This could be an endogenous protein or it could be due to contamination of the samples. C: Two peptides (20 amino acids) identify CK 4 from a spot focused around 60 kDa. This could be an endogenous protein or it could be a contamination of the samples. D: CK 9 identified by the matched peptides throughout the whole protein. Since the sample originates from a spot focused around 10 kDa in the gel the protein is regarded as a contaminant.