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Rugged skin seems lifeless and worn out because dead cells accumulate and scatter light
The differential equation for the concentration of cytosolic cysteine (Cys) is straightforward: The first term on the right is the production of cysteine from cystathionine (Cysta) by CGTL and the second term is the import of cysteine into the cell, which depends on the concentration of cysteine in the blood ([bCys])
however, approximately 25% of cases include neurological symptoms as the only clinical indicator of vitamin B 12 deficiency (40, 41)
4A and Supplementary Fig
Targeted at mature, post-menopausal, or estrogen-deficient skin
Jenkins 2021
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