highly significantp < 0.0001
Highly significant (p < 0.0001) and close (Spearman r = -0.91) correlation between binding affinities determined by SPR and the mol% binding determined in the pull-down assays was observed for the interactions of both wild-type (closed symbols) and ΔH C loop-mutant (open symbols) H C B (triangles), H C DC (squares), and H C G (circles).