人流感病毒血凝素（Human influenza hemagglutinin, HA） 是决定人病毒传染性的一类表面糖蛋白。HA 标签（HA-Tag） 来源于 HA 分子对应的 98-106 位氨基酸（YPYDVPDYA ）， 广泛用作表达载体的通用表位标签。许多融合蛋白经基因工 程重组后表达 HA tag，且融合蛋白本身的生物活性和体内 分布并不会受影响。其他常用的标签还包括 myc、Flag、His、 GST 等，标签的使用简化了蛋白的检测，分离和纯化。 本抗体特异性识别 HA Tag，不仅利于检测带 HA Tag 的 融合蛋白的表达量，另外还利于对 HA 融合蛋白的分离纯化。
-25 ~ -15℃分装保存，尽量避免反复冻融。
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