Comparing the relative content of G+C/A+T in the group of women taking oral contraceptives and the group of
women using oral contraceptives during the beginning of menstruation, no change was observed. The sequencing
results confirmed identical nucleotide sequences for both fragments of DNA. In spite of this, minor change of
nucleotide content were observed when compared the sequences of DNA for the control group and the volunteers
group taking oral contraceptives for backward fragments, when a deletion in the sequence on the 50 bp position for
the group exposed to the oral contraception was occurred