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Measurements of g_1 at low x and low Q^2 are expected to provide a sensitiveprobe of the transition from Regge to perturbative QCD dynamics, offering a newtesting ground for models of small x physics. We discuss the potential ofpolarized ep colliders (Polarized HERA and eRHIC) to investigate this physics--- varying Q^2 between 0.01 and 1 GeV^2 --- and to constrain the high-energypart of the Drell-Hearn-Gerasimov sum-rule for polarized photoproduction.Comment: 18 pages, 2 figure

$g_1$ at low x and low $Q^2$ with Polarized ep colliders