Mass photometry of membrane proteins by Olerinyova, A, Sonn-Segev, A, Gault, J, Eichmann, C, Schimpf, J, Kopf, AH, Rudden, LSP, Ashkinadze, D, Bomba, R, Frey, L, Greenwald, J, Degiacomi, M, Steinhilper, R, Killian, A, Friedrich, T, Riek, R, Struwe, W, Kukura, P