MA-104 cell culture after 4 days of cultivating ((a), (b)), light microscopy (×100 scale); SEM images of a formalin-fixed cellular epitheliocyte culture after 7 days of cultivation ((c), (d)) on the microtube surface obtained from the chitosan solution with the concentration 3.0 wt.% in a 1.5% aqueous solution of lactic acid by the wet ((a), (c)) and dry ((b), (d)) methods.