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低分子量肝素（Ｌｏｗｍｏｌｅｃｕｌａｒｗｅｉｇｈｔｈｅｐａｒｉｎ，ＬＭＷＨ）是８０年代初从一般肝素（Ｕｎｆｒａｃｔｉｏｎａｔｅｄｈｅｐａｒｉｎ，ＵＦＨ）（ＵＦＨ的分子量１２０００～１６０００道尔顿）中分离得到的较小的肝素片段，分子量在３５００～５０００道
Low molecular weight heparin (LMWH) is a small heparin fragment isolated from Unfractionated heparin (UFH) (molecular weight of 12000 to 16000 daltons) in the early 1980s and has a molecular weight of 3500 to 5000