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doi: 10.1016/bs.mie.2021.12.012
Herein, we review how the cystine transporter, xCT, and exogenous cystine fuel cancer cell proliferation and the mechanisms that regulate xCT expression and activity

According to theoretical modeling studies, however, the pKa of Sec does not alone account for the catalytic difference between Sec and Cys-substituted enzymes

The SCCS opinion is that the use of vitamin A in body lotions, up to the maximum concentration of 0.05% of retinol equivalent, is safe6

Its characteristic manifestations include a decline in overall skin texture, the appearance of fine and evenly distributed wrinkles, a slightly dull complexion, and an absence of prominent pigmentation spots or erythema
