11526
This identification, initially made by microsequence analysis , was verified by showing that (i) LR1 -DNA binding activity increased in B cells transfected with a nucleolin cDNA expression construct ; (ii) LR1 -DNA binding activity was recognized by antibodies raised against recombinant human nucleolin ; and (iii) in B cells transfected with epitope-tagged nucleolin expression constructs , the LR1 -DNA complex was recognized by the anti-tag antibody .
 LR1, epitope-tagged nucleolin expression constructs, LR1, B cells, LR1 -DNA complex, nucleolin, LR1, B cells, recombinant human nucleolin, nucleolin cDNA expression construct, nucleolin, anti-tag antibody, nucleolin
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:
 LR1, epitope-tagged nucleolin expression constructs, LR1, B cells, LR1 -DNA complex, nucleolin, LR1, B cells, recombinant human nucleolin, nucleolin cDNA expression construct, nucleolin, anti-tag antibody, nucleolin