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A Proposed Solution to the Historic Puzzle of Chargaff's Second Parity Rule

Chargaff 's first parity rule for the contents of the four nucleotides in DNA is easily understood based on the double-stranded DNA structure. However, the second parity rule, based on similar nucleotide relationships in single- stranded DNA, has been a puzzle in molecular biology, because it is impossible to imagine how pairs of G and C, and A and T are formed in the single DNA strand. In the present study, Chargaff's second parity rule can be solved based on nu- cleotide contents and the correlation between the two strands in double-stranded DNA.