2.6RNARNARNA-directedRNApolymeraseRdRPLedermann,-B.Embryonicstemcellsandgenetargeting.Exp-Physiol.2000Nov;85(6):603-13–5.ThomasP.homologousrecombinationinhumanEScellNaturepublishonline200310Feb619952617±8.±9HastyPetal;Nature;1991;350;24310.yunfengli20031211.2004-14012112612.∗–14GeorgMellitzera,b,MarcHalloneta,LanChena,Siew-LanAnga,Spatialandtemporal‘knockdown’ofgeneexpressionbyelectroporationofdouble-strandedRNAandmorpholinosintoearlypostimplantationmouseembryosMechanismsofDevelopment118(2002)57–6315.