6844
A novel gene designated cmr , which mapped to 18 . 8 min of the Escherichia coli K - 12 genome , was shown to mediate resistance to chloramphenicol when it was expressed from a multicopy vector .
 cmr
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 cmr