A biologically active substance found in the chloragocytes of certain organisms, particularly earthworms, involved in metabolism and nutrient storage.
From chlor- (green, or possibly from chloragocyte) + -gen (generator or substance), literally 'chlorago-generating substance.' This term emerged from invertebrate physiology research.
Earthworms have special cells called chloragocytes that produce chloragen—it's one of nature's ways of storing nutrients and managing metabolism, showing that even humble earthworms have sophisticated internal chemistry.
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