267
Expression of nucleoside diphosphate(NDP) kinase , which is homologous to the nm23 gene product in a variety of species, has been found to be inversely associated with metastatic potential .
 nucleoside diphosphate(NDP) kinase, nm23 gene, nm23 gene product
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 nucleoside diphosphate(NDP) kinase, nm23 gene, nm23 gene product