Enables several functions, including bile acid transmembrane transporter activity; calmodulin binding activity; and protein homodimerization activity. Involved in several processes, including homophilic cell adhesion via plasma membrane adhesion molecules; insulin catabolic process; and regulation of signal transduction. Acts upstream of or within positive regulation of MAP kinase activity. Located in several cellular components, including adherens junction; basal plasma membrane; and lateral plasma membrane. Orthologous to several human genes including CEACAM1 (CEA cell adhesion molecule 1). [provided by Alliance of Genome Resources, Apr 2022]