2475
CTDK1 and CTDK2 also differ in their protein substrate specificity .
 GENE: CTDK1; GENE: CTDK2
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: CTDK1; GENE: CTDK2