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Average cumulative migration of keratinocytes on gradients of immobilized SS-EGF, SS-IGF-1, and SS-IGF-1+SS-EGF and TCPS over 7 days. (a) g2 (power law) gradient patterns of SS-EGF (150 μg/ml), SS-IGF-1 patterned on SS-EGF (each 75 μg/ml and denoted 1/2), SS-IGF-1 patterned on SS-EGF (each 150 μg/ml) (b) g1 (quadratic) gradients of SS-EGF (150 μg/ml), SS-EGF patterned on SS-IGF-1 (each 150 μg/ml)
