Harvard neuroscientists kept peppercorn-sized clumps of human brain cells alive in a dish for more than five years, tripling the previous 694-day record set in 2021 and long enough that the organoids began mimicking developmental stages seen in living people

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A Harvard-led team has kept peppercorn-sized human brain organoids alive and maturing for over five years — more than triple the previous 694-day record — with the tissue tracking human developmental time so closely that older cells can skip ahead by months w…