9214
Competition EMSA established that constitutively expressed nuclear proteins bound the KCS element selectively ; KCS protein binding activity correlated with promoter activity in the transient transfection reporter assay .
 KCS element, KCS protein
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 KCS element, KCS protein