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In the postprandial state, glucagon rises to prevent blood sugar from crashing too low, but chronically elevated glucagon also drives hepatic glucose production and can impair fat oxidation

Despite their small size, they have immense biological significance in molecular biology: peptides function as a peptide hormone like PPY, enzymes, neurotransmitters, and signal molecules that mediate immune responses, cell signaling, tissue repair, and metabolic regulation

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MAPK signaling pathway can be activated by extracellular and intracellular stimuli, such as cytokines, growth factors, hormones and stressors

Using in vitro systems and animal based models, these studies have focused on characterizing receptor specificity, intracellular signaling fidelity, and the temporal organization of hormone secretion

Protein is an essential nutrient, meaning that it cannot be made in the body and is needed from the diet