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Naturally occurring T109 mutants have been shown to be resistant to some of these CpAMs. We found that mutation of T109 led to changes in capsid stability and recapitulated resistance to a weak CpAM, but much less so than to a strong CpAM. Examination of HBV capsid structures, determined by cryo-EM and crystallography, could not explain how T109 mutations change capsid stability and resistance. However, by mining data from a microsecond-long all-atom molecular dynamics simulation, we found that the capsid was extraordinarily flexible and that T109 can impede entry to the CpAM binding site. 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