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Table 1 Similarity table for peptide modification

From: P2P proteomics -- data sharing for enhanced protein identification

modification code -1 1 2 3 5 31 32 89 90
-1 1         
1 1 1        
2 1 0 1       
3 1 0 1 1      
5 1 0 1 1 1     
31 1 0 1 1 1 1    
32 1 0 1 1 1 1 1   
89 1 1 0 0 0 0 0 1  
90 1 1 0 0 0 0 0 0 1
  1. -1 = nothing; 1 = oxidation of M; 2 = carboxymethyl C; 3 = carbanidomethyl C; 5 = propionamide C; 31 = carbamylation of K; 32 = carbamylation of n-trem peptide; 89 = oxidation of H; 90 = oxidation of W. For the remaining codes the similarity is 1 if they are equal and 0 if the are not equal.