Table 1. Occurrence of N-X-S/T motives in tryptic peptides1

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Table 1. Occurrence of N-X-S/T motives in tryptic peptides1 Glycoproteins from Swiss-Prot DB Number of proteins Tryptic petpdies (in-silico digestion) Percentage Number of peptides N-X-S/T containing peptides Predicted glycoproteins2 15 302 1 072 858 54 000 5,0% Annotated glycoproteins3 4 492 252 492 19 253 7,6% 1. This calculation is based on the Swiss-Prot database (ver. 04.11). 2. Proteins containing N-X-S or N-X-T sequons in their amino acid sequences. 3. Proteins annotated as “glycoprotein” in the DB entries.