10420
In addition to the bZIP protein Opaque2 ( O2 ) , there are other maize endosperm nuclear proteins that recognize the O2 box in 22 kDa zein gene promoters .
 GENE: bZIP protein Opaque2; GENE: O2; GENE: O2 box; GENE: zein
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: bZIP protein Opaque2, O2, O2 box, zein 
Answer:
 GENE: bZIP protein Opaque2; GENE: O2; GENE: O2 box; GENE: zein