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Examples of droplets of concentrated liquid phases observed with a bright field microscope upon phase separation in: (a) the solution of 98 mg/ml human myeloma IgG (M12) with 5% (w/w) PEG3k incubated at 10 °C; (b) the solution of 1 mg/ml pharmaceutical IgG (P2) with 11% (w/w) PEG3k incubated at 21 °C.
