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this post was submitted on 08 Jan 2024
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Today I Learned (TIL)
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It's a fourth cone in the eyes. Interesting that the brain just rolls with it being present. Something similar was done to give squirrel monkeys the missing cone they need to see red: https://www.nationalgeographic.com/science/article/gene-therapy-gives-full-colour-vision-to-colour-blind-monkeys