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An Alternative Mode of Elimination of Resin from Epithelial Cells of Resin Ducts in Pinus sylvestris Ultrastructure of the Floral Nectary of Arabidopsis thaliana L. Prepared from High Pressure Freezing and Freeze Substitution Ultrastructure of the Vegetative Cells of Nostoc flagelliforme Prepared with High Pressure Freezing and Freeze Substitution Technique Cryo-electron microscopy and its application in studies of plant (animal) materials