A doubt in biotech question
Endogenous just means that it is naturally occurring in the organism:

http://www.dictionary.com/browse/endogenous

endogenous cytoplasmic defense gene is a general description of a gene that is cytoplasmic and whose function is defending the organism. There isn't THE Endogenous cytoplasmic defense gene. There are many endogenous cytoplasmic defense genes. Note that it is the protein coded in the gene that is cytoplasmic, not the gene itself. It should say 'gene for endogenous cytoplasmic defense protein'.