Gary-Bobo G et al. - Juxtaposition of functional SRF wild-type and failing SRF mutant cardiomyocytes generates deleterious heterogeneity in the myocardium. The results show that SRF contributes to the capacity of cardiomyocytes to remodel their shape and contractile functions in response to their local environment; suggesting that it may play a role in pathologies involving regional alterations of ventricular mechanics in the heart.