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(a) Inward flux per period for thecate cells with different stalk lengths and a tethered cell (infinite stalk length) as well as the inward flux to a corresponding slow swimmer as a function of collar length. (b) For a thecate cell with typical microvilli collar length of 5.8 μm, inward flux as a function of stalk length. Also shown is the flux to a cell tethered midwater (infinite stalk length), indicated by the arrow. (Online version in colour.)
