6774
One such system is the Lux operon of " Aliivibrio fischeri , " which codes for the enzyme that is the source of bacterial bioluminescence , and can be placed after a respondent promoter to express the luminescence genes in response to a specific environmental stimulus .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None