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countable and uncountable, plural glycogens
(biochemistry) A polysaccharide that is the main form of carbohydrate storage in animals; converted to glucose as needed. quotations examples
Specifically the liver converts glucose into glycogen — a more compact chemical. It is a little bit like shrink-wrapping food so you can pack more of it into your freezer.
2019, Bill Bryson, The Body: A Guide for Occupants, Black Swan (2020), page 175