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Particle characterization of ME and ME-lipid A co-formulations. (A) The size distribution of ME co-formulated with BECC438b and BECC438s does not appear to change substantially. (B) Likewise, the size distribution of ME co-formulated with BECC470b and BECC470s remains rather constant. (C) The zeta potentials for ME and the ME-lipid A co-formulations are different due to the negative charge contributes by the lipid A analogues.
