Fig. 7. Summary of the effects of intracellular glutamine level (A - reduced glutamine; B - reduced glutamine and inhibition of glutamine synthesis - schemes above) (C- increased glutamine - scheme below) on protein turnover in myotubes. Intracellular L-glutamine contents do change protein turnover. Black arrows indicate actions that did not have significance result; Orange arrows indicate actions that have significant result; dashed black arrows indicate actions that may occur in the myotubes.