摘 要: | INTRODUCTIoNltisknownthatDNAcanadoptdifferentstructuresaccordingtodifferentnucleotidesequenceandenvironment1].Underphysio1ogicalconditions,specificsequenceDNAcanformnon-B-DNAstrUctUres,suchasZ-DNA,cruciformDNA,triplexandquadrupIexDNAl-4].lnl99O,Baietal.directlyobservedwithSTMbraid-liketriple-strandedDNAformingfromtheheat-denaturedA-DNAHindIIIinvitro5,6].Inl993,caoetal.investigatedtheheat-denatUredx-DNAHindInsystemindetailusingcommonbiologicalmethods,andsuccessfullyisol…
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