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Bioluminescence

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Open Unknowns

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Cross-Domain Bridges

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Active Hypotheses

Open Unknowns (1)

Unknown Which tautomeric form of oxyluciferin — enolate, keto, or phenolate — is the actual light emitter in firefly bioluminescence, and how do active-site electrostatics and protonation state tune emission from 540 nm (green) to 620 nm (red) without changing the luciferin substrate? u-oxyluciferin-excited-state-mechanism-enol-vs-keto

Active Hypotheses

Hypothesis The spectral peak of bioluminescence emission in mesopelagic organisms (400-1000 m depth) has coevolved with the peak sensitivity of visual pigments in predators at corresponding depths, with both tracking the depth-dependent blue-shifting of residual downwelling daylight, producing a tight correlation between depth, emission lambda_max, and predator rhodopsin lambda_max. medium

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Generated 2026-05-10 · USDR Dashboard