6476
In mammalian cells , phosphorylation of eIF - 2 alpha inhibits the activity of eIF - 2B , the GDP - GTP exchange factor for eIF - 2 .
 GENE: eIF - 2 alpha; GENE: eIF - 2B; GENE: GDP - GTP exchange factor; GENE: eIF - 2
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: eIF - 2 alpha, eIF - 2B, GDP - GTP exchange factor, eIF - 2 
Answer:
 GENE: eIF - 2 alpha; GENE: eIF - 2B; GENE: GDP - GTP exchange factor; GENE: eIF - 2