UAS regulatory sequences drive expression of Act57B carrying an amino acid substitution equivalent to a variant that has been reported to be associated with hypertrophic cardiomyopathy when mutated in the human ACTC1 ortholog. The protein is tagged with GFP. (FlyBase curator comment: the mutation in the Act57B gene is given as A295S in FBrf0236636, however analysis of the release 6.32 annotated gene model indicates the change to be A296S).