1027
A mutant of KBF1/p50 ( delta SP ), unable to bind to DNA but able to form homo- or heterodimers , has been constructed.
 protein: delta SP; protein: KBF1/p50; protein: heterodimers
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: delta SP; protein: KBF1/p50; protein: heterodimers