The KAI1 (kang ai 1) metastasis suppressor gene, also known as CD82, is a member of the tetraspanin superfamily that form a complex protein network on cellular membrane to regulate multiple biological processes The KAI1 (kang ai 1) metastasis suppressor gene, also known as CD82, is a member of the tetraspanin superfamily that form a complex protein network on cellular membrane to regulate multiple biological processes