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. 2021 Jan 31;11(2):373–395. doi: 10.1007/s13346-021-00918-5

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© The Author(s) 2021, corrected publication 2021

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Fig. 1 — Types of channel for FlFFF. Symmetric flow FFF a; asymmetric flow FFF b; hollow fiber flow FFF c; electrical asymmetric flow FFF d; stopless frit-inlet FFF e1 and traditional FFF with focusing and elution step e2; traditional outlet f1 and slot-outlet f2