Most significantly aligning sequences of each of the three human proteins tested for structural homology with H. pylori G27. “Expectation value” is the number of hits one would expect to occur merely by chance. “% of identity” represents the percentage of identical amino acids in the two compared sequences”. “% of positivity” means the percentage of residues in the two aligned sequences that are very similar to each other. “% of gaps” mean the percentage of intervals lacking linear homology between two homologue sequences.