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. 2021 Sep 3;7(36):eabh0273. doi: 10.1126/sciadv.abh0273

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Fig. 5. — (A) pH-responsive albumin microswimmers. (B) The volumetric swelling ratio of the microswimmers as a function of pH. The swelling ratios are normalized to the initial volume at pH 7. (C) Two-way shape memory behavior of the microswimmers in response to pH change. (D) pH-stimulated, body swelling–driven drug release from the albumin microswimmers. (E) Trypsin-stimulated two-step drug release dynamics from the microswimmers. (F) Trypsin-mediated cargo release kinetics at pH 7. (G) Representative fluorescence images of the drug-loaded microswimmers demonstrating the complete drug release with enzymatic degradation.