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The electronic band structure of both the monoclinic and orthorhombic cysteine polymorphs is investigated using density functional theory (DFT) calculations in the generalized gradient approximation (GGA). Besides, orthorhombic cysteine crystals were grown, and their optical absorption was measured, being estimated an energy gap of Egexp=4.68eV for recrystallized cysteine powder. The existence of...