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Cancer cells supplemented with selenium (30 nM sodium selenite or 10 M SeMet) showed elevated levels of GPX1 and TXNRD1 enzyme activity, effectively protecting against DNA strand breaks induced by ultraviolet A- or H 2 O 2 -induced oxidative stress 135
The intracellular and the microenviromental molecular signalling pathways that drive the development of oral mucosal melanin pigmentation remain largely unknown [7]
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