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Your body produces it but levels decline significantly with age
10.1016/j.hrthm.2021.03.007 79
IGF-1 LR3 versus IGF-1 DES Another common IGF-1 variant, IGF-1 DES (Des 1-3), takes the opposite approach to modification
Widely targeted analysis of intracellular metabolites GC coupled to a triple-quadrupole mass spectrometer The GCMS/MS method was performed on a 7890B gas chromatography system (Agilent Technologies) coupled to a triple-quadrupole 7000C (Agilent Technologies) equipped with a high-sensitivity electronic impact source (EI) operating in positive mode
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