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An analysis of the c - kit 5 ' flanking region using the bacterial chloramphenicol acetyltransferase gene ( CAT assay ) in human erythroleukemia HEL cells , which express the endogenous c - kit mRNA at high levels , showed that a region from - 180 to - 22 is important for the expression of the c - kit gene .
 GENE: c - kit 5 ' flanking region; GENE: bacterial chloramphenicol acetyltransferase gene; GENE: CAT; GENE: c - kit mRNA; GENE: c - kit gene
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: c - kit 5 ' flanking region; GENE: bacterial chloramphenicol acetyltransferase gene; GENE: CAT; GENE: c - kit mRNA; GENE: c - kit gene