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β_2-微球蛋白（β_2-m）自1968年Berrgard等发现以来，已逐渐应用于临床，尤其对肾脏损害的检恻起到了一定的作用。过敏性紫癫是儿童常见的出血性
β_2-microglobulin (β_2-m) has been gradually applied to clinic since Berrgard et al. discovered in 1968, especially for the detection of kidney damage. Allergic purple epilepsy is a common hemorrhagic child