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Viscosity changes at 32 °C at various shear rates for Group I (left) and Group II (right) tretinoin microparticle-based topical gels, 0.04 %, 0.06 %, 0.08 % and 0.1 % w/w. For each strength, 3 replicates were tested, and relative standard deviations did not exceed 5 % of the viscosity values plotted.
