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Practice Speaking: Read Aloud
ID: #52080
Long Physical Characteristics
Usually, age is determined by physical characteristics, such as teeth or bones. Great if you have body. Researchers have tried unsuccessfully to use blood. But in this study, scientists used immune cells called T-cells. T-cells recognize invaders through receptors that match molecules on bacteria, viruses, even tumors. The cellular activity also produces circular DNA molecule as by-product.
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