fig4
![DNA direct reversal repair and alkylating agent drug resistance](https://image.oaes.cc/2aa80543-de21-4895-8962-66b0d201e8f5/3924.fig.4.jpg)
Figure 4. O6methylguanine:thymine base pairing that leads to G→A mutation. The pairing is based on data from the crystal structure of the pair in oligodeoxyribonucleotides[8]. Note that the thymine tautomer formed is not the standard tautomer drawn for thymine in Watson-Crick base pairs.