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. Author manuscript; available in PMC: 2019 Sep 24.
Published in final edited form as: Sci Robot. 2017 Mar 1;2(4):eaam6431. doi: 10.1126/scirobotics.aam6431

Fig. 2. Representative examples of micro/nanorobot-based in vivo delivery.

Fig. 2.

(A) Acid-powered zinc-based micromotors for enhanced retention in the mouse’s stomach (34). (B) Enteric micromotor, coated with a pH-sensitive polymer barrier (enteric coating) to bypass the acidic stomach environment, to selectively position and spontaneously propel in the gastrointestinal tract (35). (C) Controlled in vivo swimming of a swarm of bacteria-like microrobotic flagella (36). (D) Magneto-aerotactic motor-like bacteria delivering drug-containing nanoliposomes to tumor hypoxic regions (37).