Tags: Protein.
In molecular biology the calponin family repeat is a 26 amino acid protein domain. Calponin-1 (CNN1) contains three copies of this domain. This domain is also found in vertebrate smooth muscle protein (SM22 or transgelin) and a number of other proteins whose physiological role is not yet established including Drosophila synchronous flight muscle protein SM20 Caenorhabditis elegans unc-87 protein rat neuronal protein NP25 and an Onchocerca volvulus antigen.