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SEM images of the formulations: HA-Dop with the addition of (a1) MP, (a2) free ATV, (a3) MP+free ATV; Belotero Balance® with the addition of (b1) MP, (b2) free ATV, (b3) MP+free ATV. Red arrows indicate MP; blue arrows: crystals of free ATV; green arrows: aggregates of ATV crystals. Scale bar: 10 μm; magnification: ×300.
