3530
To clarify the difference , both the Crk II and Crk II - 23 , proteins were expressed in E . coli and examined their binding capacity in vitro .
 GENE: Crk II; GENE: Crk II - 23
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: Crk II; GENE: Crk II - 23