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. 2013 Mar 5;4:1550. doi: 10.1038/ncomms2516

Figure 4. Collagen spectra of modern and fossil Camelini.

Figure 4

Ellesmere fossil camel (NUFV 210), Yukon fossil camel (CMN 48096), Camelus bactrianus, Camelus dromedarius. ‘α’ denotes homologous peptides (Supplementary Fig. S4), modified in the Bactrian camel (α′); ‘β’ denotes one of the most intense species markers, shared by all camelines analysed here, observed at m/z 2,992 representing the peptide sequence GPSGEAGTAGPOGTOGPQGLLGAOGFLGLOGSR, where O=Hyp and the Q is deamidated (Supplementary Fig. S5). Insets show the isotopic envelopes for peptide ‘β’ (with the monoisotopic peak marked with an asterisk), within which the effect of increased Q deamidation in the ancient peptides can be observed.