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J Biol Chem 272 : 2538025385

PMID: 38980576

Type I Borosilicate Glass Vials Low-extractable, chemically inert glass the same specification used in pharmaceutical packaging

Nevertheless, the authors posited that local, tissue-level IGF-I production in targets such as skeletal muscle cells might still be modulated, even if overall IGF-I remains relatively stable

Our small cross-sectional analysis of parallel blood and muscle samples from a set of healthy subjects showed that muscle NAD + decreases during aging, while blood levels were stable