Usually, age is determined by physical characteristics, such as teeth or bones. Great - if you have a body. Researchers have tried unsuccessfully to use blood. But in this study, the scientists used immune cells called T-cells. T-cells recognise invaders through receptors that match molecules on bacteria, viruses, even tumours. The cellular activity that produces these receptors also produces a type of circular DNA molecule as a by-product.
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Usually, age is determined by physical characteristics, such as teeth or bones. Great - if you have a body. Researchers have tried unsuccessfully to use blood. But in this study, the scientists used immune cells called T-cells. T-cells recognise invaders through receptors that match molecules on bacteria, viruses, even tumours. The cellular activity that produces these receptors also produces a type of circular DNA molecule as a by-product.