By the time Sanger sequencing was commercialized, the groundwork for an entirely new sequencing chemistry was already well underway. In 1985, Swedish biochemists Pål Nyren and Arne Lundin published a paper illustrating a procedure that measured the concentration of a molecule, called pyrophosphate (PPi), using an enzymatic cascade that emits light. In early 1986, Nyren realized that the method he’d helped develop could be applied to DNA sequencing, because PPi is naturally produced as a byproduct of DNA synthesis.5
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Confidence Change We calculated ΔBelief=LikelihoodR3−LikelihoodR1\Delta\text{Belief}=\text{Likelihood}_{R3}-\text{Likelihood}_{R1} to measure change in confidence from the first to third round. A total of 512 participants (91.9%) provided a final likelihood rating and were included in confidence change analyses.333The completion rates differed significantly by condition, χ2(4)=17.02\chi^{2}(4)=17.02, p=.002p=.002. The Random Sequence condition had the highest attrition (16.1% missing likelihood), while Rule Confirming had the lowest (1.8%).