tokens: NM23 was identified in a system of murine melanoma cell lines , in which an inverse relationship was found between NM23 expression and metastatic ability .
folded_tokens: nm23 was identified in a system of murine melanoma cell lines , in which an inverse relationship was found between nm23 expression and metastatic ability .
labels: B-protein_molecule O O O O O O B-cell_line I-cell_line I-cell_line I-cell_line O O O O O O O O O B-protein_molecule O O B-other_name I-other_name O