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Fluorescence images of quagga mussel siphons after mussels were dosed with a) 200 nm (1 × 10–12 m); b) 1000 nm (1 × 10–12 m); and c) 2000 nm (0.01 × 10–12 m) carboxylic‐acid‐terminated PS beads with a red dye and allowed to clear until their feces were no longer fluorescent (see Figure 2 for clearance times).
