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The synthetic MGF peptide corresponds to the unique C-terminal portion of that splice variant, and in culture it is reported to promote proliferation of muscle precursor (satellite) cells while delaying their differentiation expanding the pool of cells available for repair [3]

The Pei et al

Phenformin was inactive against RSV and IAV at the concentrations tested

P., Yuan J

Concise review: gamma-glutamyl transferase - evolution from an indiscriminate liver test to a biomarker of cardiometabolic risk Metab Target Organ Damage 2022;2:17

Usually one of the these strategies will work but in case they still do not work, then one can go for use of larger affinity tag such as GST or MBP instead of small Histidine tag.