Cryo-EM of soft-landed β-galactosidase: gas-phase and native structures are remarkably similar by Esser, T, Boehning, J, Oenuer, A, Chinthapalli, DK, Eriksson, L, Grabarics, M, Fremdling, P, Konijnenberg, A, Makarov, A, Botman, A, Peter, C, Benesch, J, Robinson, C, Gault, J, Baker, L, Bharat, TAM, Rauschenbach, S