A tetrameric DNA structure with protonated cytosine.cytosine base pairs.
Gehring, K., Leroy, J.L., Gueron, M.(1993) Nature 363: 561-565
- PubMed: 8389423 
- DOI: 10.1038/363561a0
- Primary Citation of Related Structures:  
225D - PubMed Abstract: 
Oligomers containing tracts of cytidine form hemiprotonated base pairs at acid pH and have been considered to be double-stranded. We have solved the structure of the DNA oligomer 5'-d(TCCCCC) at acid pH and find that it is a four-stranded complex in ...