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Cells from peripheral blood (a-h) and spleen (i) of ayu, Plecoglossus altivelis altivelis after esterase (α-naphthyl butyrate method) staining. Bar=10 µm, PG: positive granule, a: A1 type, b: A2 type, c: B1 type (arrow), d: B2 type (arrow), e: B3 type (arrow), f: C1 type (arrow), g: C2 type, h: C3 type and i: F type (center).
