Bioluminescence

* See also Bio-Electronics
* See also Sea_Slugs
* See also ADAM
* See also Era_Electronics
 "Bioluminescence : Light Created Via a Biological Mechanism" 
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You've seen those 'glow sticks' they sell at amusement parks or use as 'survival' lights ? Those are based on natural biological chemicals ( LuciferinLuciferin - https://www.merriam-webster.com/dictionary/luciferin ) which when mixed produce heat-less light of various colors.
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Magic Glowey Underwater Places :
Bioluminescence exists quite alot in nature, but its faint is light visible more than 20 feet away (basic physics/optics). The light diffuses in water so fast that a 'big' mass (glow) can't be seen from even rather close distances.
Making ones self glow wastes alot of energy, which is problematic in small/single celled organisms. Maybe the writers were thinking of the types of glowing algae seen flashing in some tropical waters ( of course that is a sun powered metabolism at the ocean's surface with its plentiful resources ).
Assuming there is any nutrients to support a 'big' mass of anything down there. I hope they didn't expect/think it to be radiation to cause magical 'Mutations', cuz radiation kills off things really really well in most cases.
There are some places they've found in the deep ocean, at volcanic vents, with localized sulfur leakage and warmth ( allowing anaerobic bacteria to grow ). They have a quite close cluster of organisms eating that bacteria and each other. It all happens in the SMALL vent's immediate vicinity in a few places. If the vent is too big ( big volume of superheated water ), then the heat scalds to death everything nearby. Too far away (heat diffusing) it is back to the ambient cold temperature and sterile low oxygen environment. There is a whole ocean full of near-ice-cold water to keep some large 'pocket' of warmth from stably forming. Caverns, trapped water ? It is back to 'scalding'.
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Luminol (C8H7N3O2) is a chemical that exhibits "Chemi-luminescence", with a blue glow, when mixed with an appropriate oxidizing agent.
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Bioluminescence Used As A Circuit Manufacturing Tool :
Used with the Bio-Electronics Tech I propose for Rapture.
Bioluminescence added to these Cells ???   Hmmm, Too small/too little light to be eyeball readable ?? SO Additional cells added to the circuit manufacture 'dimple' mix that later get killed off, but are sufficient for the use ( with mechanisms for observing light patterns as measurable 'feedback' during the process ) when Training/Tuning the Cell logic connections. This all being part of a feedback production process which the Bio-Electronics circuit training machines would use, without having to 'tap' a wire probe to read what's going on at many tiny points in the circuitry.
A TV camera in a low power microscope can be used to read a grid of 'Indicators', and a simple computer program to scan/monitor ( the grid can be manually locked in optically in preparation ) the 'glow' and feed back into the training program.   These logic connections are formed using the cell's natural physiological training processes ( and this optical technique used for the 'Growth'/Training adjustments/corrections/monitoring ).
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Bio-Fluorescence - A Different Biological Effect :
Fluorescence - The property of absorbing light of short wavelength and emitting light of longer wavelength.
Bio-chemicals exist which will convert light this way, fluorescing with intensity varying with ambient conditions. In our current World, they have started to be used to observe activity within cells. Proteins which can fluoresce in a certain color can be added genetically into cells.
For Rapture's Bio-Electronics, adding condition (flag) indicators into the different cells used to build circuits would be a useful tool for various processes.
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Saturnine Symbols Written In Bioluminescent Paint ??? :
Seeing a few Saturnine Splicers all glowey ( along with some nice dark rooms we had to enter ) might have been impressive ( issue with 6+ years ago rendering/lighting issues ??? )   Seeing better Saturnine glowey symbols in dark places ( and/or in flickering lights ) on their props or trails of them might have also been a neat effect.  Having their strange symbols painted on the faces of half the corpses in Arcadia ...   A lone Saturnine wandering/skulking around Farmers Market, or hung up on a Meathook in one of the freezers ...
So much imagination, so little game to have it in.
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What a Pretty Fishy, Mr Bubbles :
Bioluminescent GoldFish  ( ones with little decorations, even advertisement signs glowing on their sides - the glowey might be genetic but the pattern would be equivalent of a tattoo or maybe some photo exposure imprinting ).   More Player Created Asset opportunity - Seriously you can be surprised by the decorations that people will come up with.
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Sinclair Solutions Cosmetics :
Bio-luminescence Technology ( an opportunity for Sinclair and his research staff ).
Now that might have been interesting - the fad ( well over by end of 1958 ) of glowey cosmetics were being resumed by Splicers  -- so you see their odd faces in the really dark areas grimacing at you. 
Glowey paints also for the masks, Art, party gimmicks.... 
Glowey Tattoos ...
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