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They identified 29 defined cell types, including immune cells that exhibited differences in their abundance and reaction time between age groups, and muscle stem cells that self-renew in youth but stall out as muscles age.

“We had constant training exercises. Our reaction time was two minutes,” he says, with a hint of pride.

Distractions slow the reaction time of automated vehicle remote drivers by over five seconds, new research has shown.

Gun violence is high, police reaction time slow.

But for most of us, gradual visual impairment is inevitable, reaction time slows, and night driving becomes more of a challenge.