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(a) Synthesis of FITC-labeled thiolated poly(acrylic acid). Thiol groups were functionalized on 11% of monomer units. (b) Bright field transmission image of microbubbles comprised of DSPC and PAA-SH-FITC, showing location of perfluorobutane gas. (c) Green fluorescence image of same, showing PAA-SH-FITC.
