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Morphological changes in A. pacificum after exposure to Y1 filtrate (2%, v/v) under an optical microscope (10 × 40). (a) Control with the addition of the same volume of 2216E; (b) 6 h treatment with Y1 filtrate; (c) 12 h treatment with Y1 filtrate; (d) 24 h treatment with Y1 filtrate.
