It is intended to identity a protein involved in a molecular mechanism between Akt and cell motility as well as to elucidate its function and find its application. In the present teachings, for achieving the above object, protein or partial peptide thereof containing an amino acid sequence identical or substantially identical to the amino acid sequence represented by SEQ ID: 2 is utilized in the screening of a compound or a salt thereof that activates or inhibits any of cell motility, cell migration and angiogenesis.