How do Gulper Eels photophores work?

So I was researching about gulper eels and I found out that they had a bioluminescent tail. I was really surprised to hear this but in all the different places I looked i could not find an explanation of the mechanism of bioluminescence. I'm assuming it's similar to other deep sea creatures with some kind of bacteria but I read one article that said it was not. It did not have any sourcing though so I'm unsure of its credibility.