In the Xanth series by Piers Anthony, the Naga really are a race of human-headed serpents that could change in between totally human and serpent forms, including any species and dimensions of snake. there are actually tyrosine (Y223) and lysine (K139) residues that may also be contributing towards the interaction https://holdenaaxvm.blog-ezine.com/30810341/little-known-facts-about-naga-26