When the ketone body acetoacetate undergoes reduction of the ketone carbonyl group,β-hydroxybutyrate,another ketone body,is formed.What is the structure of β-hydroxybutyrate? 
Definitions:
Pepsinogen
The inactive enzyme precursor of pepsin, secreted by the stomach wall and converted to the active enzyme in the presence of hydrochloric acid.
Omega-3 Fatty Acids
Essential fatty acids found in salmon and other fatty fishes, walnuts, and certain vegetable oils (e.g., canola, soybean); studies suggest that omega-3 fatty acids help lower triglycerides and blood pressure, and have other health benefits.
LDL Levels
Low-density lipoprotein levels, often referred to as "bad" cholesterol, indicative of the amount of cholesterol in the blood that can lead to plaque buildup in arteries.
Protein Metabolism
The process by which proteins are synthesized and broken down into amino acids in the body, involving digestion, absorption, and assimilation of proteins.
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