5598
The basal promoter strength of constructs that contained deletions in the U5 region of the LTR was analyzed by chloramphenicol acetyltransferase ( CAT ) assays following transfection of HeLa cells or Jurkat T - cells in the presence or absence of viral transactivator tax protein .
 GENE: U5 region; GENE: chloramphenicol acetyltransferase; GENE: CAT; GENE: tax
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: U5 region, chloramphenicol acetyltransferase, CAT, tax 
Answer:
 GENE: U5 region; GENE: chloramphenicol acetyltransferase; GENE: CAT; GENE: tax