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Figure 4: Serum IGF-1 levels in different experimental groups In addition to changes in serum levels, both KID and KIR mice saw significant increases in body weight from 4 to 16 weeks in age

Good food sources of cysteine, glutamic acid, and glycine include: Levels of cysteine can also be increased by supplementing with the cysteine precursor N-acetylcysteine (NAC)

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