Abundance of amino acids on the second position in proteins potentially cleaved by MAP in comparison with proteins containing the initial Met in the mature protein. The abundance of the most common amino acids at the N-terminus of proteins undergoing cleavage by MAP (Ala, Ser, Gly, Val and Pro) was compared between the first position of possible MAP cleaved proteins (−Met) in human (n=1,034) and yeast (S. cerevisiae, n=268), and the second position of Met initiated proteins (+Met). The analysis revealed no significant difference between abundance of Ala as second amino acid in human and Ser as second amino acid in yeast between MAP cleaved and non-cleaved proteins. However, a more apparent difference was shown for Gly, Val and Pro in both human and yeast.