CaM (200 pmole) was incubated with each peptide (E0, E1, E2, E3, E4, E5) by increasing CaM:peptide molar ratio for 1 h. The samples were electrophoresed on 18% nondenaturing gels in the presence of 100 μM Ca2+ (Panel A), or 1 mM EGTA (Panel B). The free CaM and CaM/peptide complex were visualized by Coomassie-blue R250 and indicated. The lane 1 in each gel contains CaM alone. CaM:peptide ratios used were: lane 2 (1:0.15), lane 3 (1:0.3), lane 4 (1:0.5), lane 5 (1:1), lane 6 (1:2), lane 7 (1: 5) and lane 8 (1:10).