Sequence coverage map of the CaM protein sequence. Black lines under the sequence indicate tryptic peptides whereas red lines designate chymotryptic peptides. The four EF-hands are super-scored by red (EF-1), magenta (EF-2), olive (EF-3) and navy (EF-4). Residues shaded in green, cyan and dark yellow represent the E helix, calcium loop and F helix of each EF-hand, respectively. Residues boxed in red are resolved by MS/MS analysis.