Properties of the identified Khib peptides. (A) The Khib sequence motifs and conservation of Khib sites. The size of the letter indicates the frequency of the amino acid residing at that position. (B) Frequency of each motif occurring in peptides with Khib modification. Motif score was also indicated in the histogram. (C) Heat map showing the frequency of the amino acid residues around the Khib sites. The enrichment  and dispersion (green) of amino acids from −10 to +10 flanking the Khib sites.