New form of DNA identified in human cells
In a first, Australian researchers have identified a new DNA structure inside cells, called the i-motif. DNA's double-helix structure was discovered by James Watson and Francis Crick in 1953, where letters A pair with T and C with G. However, in the four-stranded 'knot' of i-motif, C letters on the same strand of DNA bind to each other, said researchers.