7842
Based on the occurrence of several transcription signals in the Thermus pyr promoter region and strong amino acid sequence identities ( about 60 % ) between Thermus PyrR and the PyrR attenuation proteins of two Bacillus sp . , we propose a regulatory mechanism involving transcriptional attenuation to control pyr gene expression in Thermus .
 GENE: Thermus pyr promoter region; GENE: Thermus PyrR; GENE: PyrR attenuation proteins; GENE: pyr gene
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: Thermus pyr promoter region, Thermus PyrR, PyrR attenuation proteins, pyr gene 
Answer:
 GENE: Thermus pyr promoter region; GENE: Thermus PyrR; GENE: PyrR attenuation proteins; GENE: pyr gene