4637
We identified Tyr ( 112 ) and Leu ( 175 ) within the RNA - binding domain of the U1 70K protein to be cross - linked to G ( 28 ) and U ( 30 ) in stem - loop I , respectively .
 GENE: U1 70K protein
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: U1 70K protein