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  <Comment Source="HomologyConvert">This pathway was inferred from Homo sapiens pathway [http://www.wikipathways.org/index.php?title=Pathway:WP311&amp;oldid=21335 WP311(r21335)] with a 55% conversion rate.</Comment>
  <Comment Source="WikiPathways-description">Ketone bodies are three water-soluble compounds that are produced as by-products when fatty acids are broken down for energy in the liver and kidney. They are used as a source of energy in the heart and brain. In the brain, they are a vital source of energy during fasting.

Source: [Wikipedia](https://en.wikipedia.org/wiki/Ketone_bodies)</Comment>
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