bilin

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: Beyond energy, bilins serve as "eyes" for many organisms. Phytochromes in plants and cyanobacteriochromes in bacteria use bilins to sense red and far-red light, triggering vital responses like germination, flowering, and shade avoidance.

: For organisms like cyanobacteria and red algae, bilins (such as phycocyanobilin) act as light-harvesting pigments, allowing them to utilize a wider range of the light spectrum than plants that rely solely on chlorophyll. : Beyond energy, bilins serve as "eyes" for many organisms

In medicine, refers to Biliary Intraepithelial Neoplasia. This is a microscopic, pre-invasive neoplastic lesion of the biliary tract—essentially a precancerous state that can lead to cholangiocarcinoma. : Beyond energy

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