699
Fourth, extensive purification by several cycles of TRE -DNA affinity chromatography resulted in the 32 , 36 to 42 and 110 kD proteins and to less extent the 50 kD factor .
 protein: 50 kD factor; DNA: TRE
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: 50 kD factor; DNA: TRE