Initial screen for retroaldolase activity exerted by various calmodulin mutants: F92K (black circle), A128K (blue square), M109K (green diamond), L105K (red left-facing triangle), V108K (purple right facing triangle), M124K (M124K bright blue triangle), F141K (orange downward facing triangle). Conditions: pH 8.0; 50 µM methodol; 50 μM protein.