The 'treadmilling' phenomenon in actin filaments occurs when:
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Correct answer: Subunit loss at the minus end matches subunit gain at the plus end
Treadmilling occurs when the rate of G-actin addition at the barbed (plus) end exactly equals the rate of loss at the pointed (minus) end. The filament maintains a constant length while effectively translocating, a process important for cell motility and cytoplasmic reorganization.
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