4519
A 40 - fold stimulation of chloramphenicol acetyltransferase activity mediated by four tandem repeats of the SNE could be induced within 2 h ( and up to 250 - fold within 6 h ) after addition of TPA in DNA - transfected U - 937 cells , indicating that the stimulation appeared likely to be a true protein kinase C - mediated signal transduction event rather than a differentiation response .
 GENE: chloramphenicol acetyltransferase; GENE: SNE; GENE: protein kinase C
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: chloramphenicol acetyltransferase; GENE: SNE; GENE: protein kinase C