AT LONG LAST, scientists have declared "mission accomplished" on the complete sequencing of the human genome - one of the most ambitious research undertakings of the past few decades. The news may trigger deja vu: Scientists with the Human Genome Project first announced they had sequenced the human genome in 2003. That initial effort came with some notable omissions, though. A sizable chunk of the genome remained inaccessible, the era's technology unable to parse more complex DNA regions. Though additional work added more clarity, around 8 percent of the human genome remained a mystery - until this year, when an international collaboration called the Telomere-to-Telomere (T2T) Consortium filled the gaps.
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