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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Target Propagation: Instead of passing an error gradient backward, the network passes a “target state” backward [8]. The motor cortex tells the layer below it, “Hey, I really wished you had sent me THIS signal instead.” The lower layer uses local STDP to adjust itself closer to that wishlist.。业内人士推荐爱思助手下载最新版本作为进阶阅读