In response to the disagreement classifying the nature of A*-T* stability, Brovarets et al. employed Møller-Plesset second-order perturbation theory (MP2) with the 6-311++G(d,p) basis set to model the double proton transfer tautomerisation in both A-T and G-C base pairs. The author reported the lifetimes of the A*-T* and G*-C* base pairs as 6.5 fs and 160 fs, respectively, revealing that the A*-T* configuration could not exist for long enough in equilibrium to be relevant to spontaneous mutagenesis.