NM23A metastasis inhibition factor NM23 NDK A nucleoside diphosphate kinase A non-metastatic cells 1, protein (NM23A) expressed in expressed in non-metastatic cells 1, protein NM23-M1 NDP kinase A tumor metastatic process-associated protein nucleoside-diphosphate kinase 1 nucleotide diphosphate kinase NDPK-A