5561
One class of plasmids contained tRNA ( His ) genes and conferred efficient suppression only when cells were starved for histidine ; these plasmids suppressed a gcn2 deletion much less efficiently than they suppressed gcn2 - 507 .
 GENE: tRNA ( His ) genes; GENE: gcn2; GENE: gcn2 - 507
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: tRNA ( His ) genes, gcn2, gcn2 - 507 
Answer:
 GENE: tRNA ( His ) genes; GENE: gcn2; GENE: gcn2 - 507