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. 2011 Mar 14;6(3):e17545. doi: 10.1371/journal.pone.0017545

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Darpel et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Purified saliva proteins (20 µg) from C. nubeculosus (lane 1) and C. sonorensis (lane 2) were analysed on 15% SDS-PAGE and visualized using silver staining. A representative figure of at least four separate and independent saliva collections is shown. A cluster of saliva proteins was identified between 40–70 kDa and 13–17 kDa molecular weight for both species. However C. sonorensis saliva has an additional prominent protein band at around 29 kDa (arrow), which was identified as “late trypsin” using mass spectrometry analysis. The presence of this 29 kDa protein in C. sonorensis saliva was consistent in 5 independent saliva collections.