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A, Dissected midgut of Lutzomyia longipalpis showing the promastigote secretory gel plug (*) in a sectioned stomodeal valve (Sv). Abm = abdominal midgut; Thm = thoracic midgut; C = crop, Mt = midgut. B, Enlargement showing details of the promastigote secretory gel plug (*) with a massive concentration of promastigotes (arrows). C = crop.
