The four people on the bench represent the different conditions that GDF15 may be useful in diagnosing or treating. http://www.cgpgrey.com [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons.
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N. R. Gough, GDF15: Heart Hormone, Appetite Suppressant, Marker of Neurodegenerative Disease. BioSerendipity (19 September 2017) https://www.bioserendipity.com/2017/09/19/gdf15-heart-hormone-appetite-suppressant-marker-of-neurodegenerative-disease/