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(a) Light transmission freeze-drying microscopy of a 5% BSA–sucrose solution. (b) OCT–FDM for BSA–sucrose formulation. (1) −24.3°C, (2) −22.3°C, and (3) −15.2°C. (Left) x–y view, (right) y–z view (video 13-–x–y cross section, video 14—y–z cross section).
