Extrapolating the trained model to other forms of DNA So far, the density prediction model has only been applied to structures in the canonical B-DNA form, which seems appropriate since the model was trained on data from B-DNA structures. To get a sense for how well the model can extrapolate to the other structural forms of DNA, the model was additionally tested on A-and Z-DNA structures. Experimentally resolved DNA structures from the Protein Data Bank (PDB) were trimmed into 6-mers to make them tractable for quantum reference calculations. The error in the model-predicted densities was quantified using ϵ ρtrue in the same way as before. The results are summarized in Table . The predicted densities of these structures can be found in the ESI † as Fig. .