2850
The IR4 ORF exhibits significant homology to the immediate - early gene US1 ( ICP22 ) of herpes simplex virus type 1 and to the ICP22 homologs of varicella - zoster virus ( ORF63 ) , pseudorabies virus ( RSp40 ) , and equine herpesvirus 4 ( ORF4 ) .
 GENE: immediate - early gene; GENE: US1; GENE: ICP22; GENE: ICP22; GENE: ORF63; GENE: RSp40
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: immediate - early gene; GENE: US1; GENE: ICP22; GENE: ICP22; GENE: ORF63; GENE: RSp40