8630
Rex - 1 , a gene encoding a transcription factor expressed in the early embryo , is regulated via Oct - 3 / 4 and Oct - 6 binding to an octamer site and a novel protein , Rox - 1 , binding to an adjacent site .
 GENE: Rex - 1; GENE: Oct - 3 / 4; GENE: Oct - 6; GENE: Rox - 1
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: Rex - 1, Oct - 3 / 4, Oct - 6, Rox - 1 
Answer:
 GENE: Rex - 1; GENE: Oct - 3 / 4; GENE: Oct - 6; GENE: Rox - 1