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(4-AP)–PLGA–PEG injection on the mouse sciatic nerve using small animal ultrasonography. (A) Longitudinal visualization of the sciatic nerve using the Vevo 3100 40 MHz ultrasound probe. (B) Identification of the 20 G needle with the nerve. (C) Positioning the needle over the sciatic nerve pre-injection. (D) Visualization of (4-AP)–PLGA–PEG on the sciatic nerve post-injection.
