Protein assemblies ejected directly from native membranes yield complexes for mass spectrometry מאת Chorev, D, Baker, L, Wu, D, Beilsten-Edmands, V, Rouse, S, Zeev-Ben-Mordehai, T, Jiko, C, Samsudin, F, Gerle, C, Khalid, S, Stewart, A, Matthews, S, Grünewald, K, Robinson, C