DNA 73˚: B-DNA 83˚ ˚
||Record MT Jr et al., Double helical DNA: conformations, physical properties, and interactions with ligands. Annu Rev Biochem. 1981 50 :997-1024. p.999 3rd paragraphPubMed ID7023371
|| Mandelkern M, Dattagupta N, Crothers DM. Conversion of B DNA between solution and fiber conformations. Proc Natl Acad Sci U S A. 1981 Jul78(7):4294-8.  Hogan M, Dattagupta N, Crothers DM. Transient electric dichroism of rod-like DNA molecules. Proc Natl Acad Sci U S A. 1978 Jan75(1):195-9.PubMed ID6945584, 272634
||P.999 3rd paragraph: "Electric dichroism measurements on DNA fragments."
||P.999 3rd paragraph: "Electric dichroism measurements on DNA fragments indicated that the tilt of the bases was not 83 deg as in the B-DNA structure but closer to 73 deg (primary sources), a value similar to that predicted by the conformational energy minimization technique of Levitt (ref 25). However a tilt of 83 deg was observed if measurements were done under conditions at which aggregation of DNA fragments occurs, which suggests that intermolecular interactions may affect structure (primary source 16)."