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Titration of (A) POPS (51 mM) and (B) POPC/SM/Chol liposomes (54 mM) with a dopamine solution (4.2 mM) in 1 mM PBS at 25 °C. Each peak corresponds to a 2 μL injection. In the case of POPS, the lipid/dopamine ratio ranged from 1214:1 to 64:1, while in POPC/SM/Chol liposomes this ratio ranged at the end of titration from 1286:1 to 68:1.
