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Permeability of the blood—brain barrier for protein fractions 50-100 kDa (PF50–100) of Cellex Daily preparation labeled with fluorescent tracer FITC and non-conjugated FITC were compared after intranasal administration of the preparations to healthy rats. Fluorimetrical analysis of the serum and cerebrospinal fluid samples showed that Cellex Daily PF50–100-FITC administered intranasally penetrated...