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DNA sequencing tubes and hard copies of the genetic data revealed by sequencing the DNA extracted from the preserved eyebals of John Dalton, English chemist, who died in 1844 leaving his eyeballs to the Manchester Literary and Philosophical Society. Dalton was colour-blind and published the first scientific paper on the subject in 1798. Subsequent genetic investigation in 1995 pin-pointed the gene mutation responsible for the condition and this is marked with a black arrow on the sequencing print-out.