= Uniform wall charge and polymer entry scaling
A homogeneous charged channel can add a constant electro-osmotic drift to the ideal electrophoretic <velocity> at fixed field. It changes the coefficient of a linear length-versus-entry-time law without generating a new <length> exponent. Charge-dependent adsorption, heterogeneous trapping or cancellation of drift followed by <diffusion> lies outside that simple claim; wall charge cannot be excluded as an indirect cause in every real experiment.
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