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Pacifastacus leniusculus: fine structure of the arthrobranch with references to active ion uptake.
1 2 3 1 2 3 4 5 Maxillipeds Pereopod Thoracic Somite Appendages 1 2 3 1 2 3 4 5 Pleurobranchs - - - + + + + + Arthrobranchs - - - 1 1 1 1 - Podobranchs - r - - - - - - Epipods + + + - - - - - Exopods + * - - - - - - - Setobranchs - - - - - - - - TABLE 2.