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. 2009 Oct 23;4(10):e7537. doi: 10.1371/journal.pone.0007537

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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The features of the protein “X” sequence include a predicted signal peptide (the sequence 5′ of the arrow) and cleavage site (at the arrow), a trypsin-like N-terminal motif (open box around IVGG), the three catalytic residues (white letters) in the three conserved motifs (gray boxes) of a serine protease, and the four peptides recovered from MS/MS analysis (labeled 1–4 and highlighted in bold and underlined).