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Ferning patterns observed after evaporation of microdroplets of human tears, alone and in the presence of MMP. (A) Pure tear, (B) Tears + 0.05% CHA, (C): Tears + 0.05% HA, (D) Tears + 0.05% CMC, (E) Tears + 0.05% GG. The field of view is 0.8 mm × 0.8 mm.
