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Percentage of α-ZEL, β-ZEL, and BEA remaining in the medium of SH-SY5Y cells after treatment for 24, 48, and 72 h at different concentrations individually or in combination by LC–ESI–qTOF-MS. (a) α-ZEL; (b) β-ZEL; (c) BEA; (d) α-ZEL + BEA and (e) α-ZEL + β-ZEL + BEA.
