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Images of ARSs after exposure to various US pressures on day 1. ARSs exposed to superthreshold US (i.e. > 2.2 MPa) show bubble formation on day 1, while subthreshold US (i.e. < 2.2 MPa) exposures yield no bubble formation. Scale bar: 8 mm. The generated bubbles increase in size by day 2 due to in-gassing.
