B. Blow up of the ESI-mass spectrum of the TF:proOmpA:SecB4 super-complex from A (complete dataset in Fig. EV3). Left: charge state distributions, at the indicated m/z range. Right: masses deconvoluted from the mass spectra (as in Fig. 2B). Inset cartoon depicts stoichiometry. Representative spectrum shown; n=2 biological replicates. 