899
Unexpectedly , all ENK - specific motifs formed specific and highly abundant protein - DNA complexes when nuclear extracts from the human tumor cell line ( HeLa ) , which does not express ENK , were used .
 GENE: ENK - specific motifs; GENE: ENK
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: ENK - specific motifs; GENE: ENK