6750
UV cross - linking experiments demonstrated that HSV infection caused enhanced binding of protein factors , including the 64 - kDa component of cleavage stimulation factor ( CstF ) , to poly ( A ) site RNAs from virus genes of all temporal classes and that this enhanced binding required expression of IE63 .
 GENE: 64 - kDa component of cleavage stimulation factor; GENE: CstF; GENE: IE63
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: 64 - kDa component of cleavage stimulation factor, CstF, IE63 
Answer:
 GENE: 64 - kDa component of cleavage stimulation factor; GENE: CstF; GENE: IE63