May act as a scaffolding protein within caveolar membranes, functionally participating in formation of caveolae or caveolae-like vesicles. Heterooligomeric complex of flotillins 1 and 2 and caveolins 1 and 2. Membrane-associated protein of caveolae. Expressed in brain and ventral nerve cord from stage 12-16 of embryogenesis. Belongs to the band 7/mec-2 family. Flotillin subfamily.