Figure 2.

Concordance of milk protein epitope recognition by IgA in paired mother’s serum and breast milk samples. The frequency of peptide recognition is plotted for each protein. Peptide epitopes are marked with a red bar and determined as described in Materials and Methods section. Cohen’s Kappa coefficient for paired milk and serum samples is shown for each epitope as a symbol. Cohen’s Kappa varies between 1 and −1. The maximum value of 1 signifies complete concordance between the two sample types whereas 0 signifies complete independence, i.e. coincidence is not greater than what would be expected by random chance.