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Representatives of major groups of mollusc pathogens. Arrows in each panel indicate representative cell forms. (a) Perkinsus marinus infecting oyster C. virginica. (b) Haplosporidium nelsoni infecting C. virginica. (c) Bonamia ostreae infecting oyster O. edulis. (d) Marteilia refringens infecting O. edulis. All scale bars, 20 µm.
