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Nässel DR.Nässel DR.Microsc Res Tech. 1999 Jan 15-Feb 1;44(2-3):121-36. doi: 10.1002/(SICI)1097-0029(19990115/01)44:2/3<121::AID-JEMT6>3.0.CO;2-F.Microsc Res Tech. 1999.PMID: 10084821Review.