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Scanning electron micrographs of recombinant human epithelial growth factor liposomal dry powders prepared by ultrasonic spray freeze-drying (A) and lyophilization (B) (sucrose to phospholipid ratio 2:1) after 15 minutes of storage at 60% relative humidity.
Abbreviations: Acc V, acceleration voltage; Magn, magnification; Det, detector; SE, quadratic equation; WD, working distance; Exp, exponent.
