1965
The present paper studies the expression of the NM23 .H1 gene in cell lines which derive from primary or metastatic human malignant melanomas in relation to staging, infiltration degree, lymphocytic infiltration , cell morphology , cell pigmentation , karyotype , and disease-free survival .
 cell lines, NM23, NM23 .H1 gene
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:
 cell lines, NM23, NM23 .H1 gene