2451
We have also found that the in vitro interaction between the SV40 octamer motif and the lymphoid cell - specific protein oct - B2 was negatively modulated by a component present in the nuclear extracts from several lymphoid cell lines .
 lymphoid cell - specific protein oct - B2
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 lymphoid cell - specific protein oct - B2