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PB1 and PB2 do not substantially scavenge superoxide in a cell-free system. PB1 and PB2 exhibit very low superoxide scavenging activity in a non-dose-dependent manner. Their borane-deprotected analogs (dPB1 and dPB2), as well as TCEP and the borane-deprotecting agent DABCO, do not show significant reduction in superoxide levels at any tested concentrations: ∗, p < 0.05; ∗∗, p < 0.01.
