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Internalization of neuraminidase-loaded (DS/PArg)2 microcapsules after they were added to the HUVEC culture medium for different lengths of time. (a) t = 0.5, (b) t = 1, (c) t = 2 and (d) t = 3 h. The main panel shows the enface image at a given z-depth. The bottom and side panels show the x–z and y–z cross-sectional images, respectively.
