The invention provides methods for identifying modulators of mammalian, e.g., human, h2-calponin, the calponin isoform of relatively neutral pI. H2-calponin exerts an effect on the migration and proliferation of a variety of muscle (smooth muscle) and non-muscle cells and is an actin filament-associated regulatory protein influencing the structure of the actin cytoskeleton. Modulators of the activity levels of this protein are useful in preventing, ameliorating, or treating a variety of diseases, disorders or conditions characterized by aberrant cell migration and/or cell proliferation.