Membrane-cytoskeleton-associated protein that promotes the assembly of the spectrin-actin network. Binds to calmodulin. Heterodimer of an alpha and a beta subunit or an alpha and a gamma subunit. Additional isoforms seem to exist. Each subunit is comprised of three regions: a NH2-terminal protease-resistant globular head region, a short connecting subdomain, and a protease-sensitive tail region. Belongs to the aldolase class II family. Adducin subfamily.