Enables cell adhesion molecule binding activity. Involved in brain development and liver development. Located in neuron projection; plasma membrane; and postsynaptic density. Biomarker of hepatocellular carcinoma and lung adenocarcinoma. Human ortholog(s) of this gene implicated in breast carcinoma and prostate cancer. Orthologous to human CADM1 (cell adhesion molecule 1). [provided by Alliance of Genome Resources, Apr 2022]