A protein or enzyme found in milk that has specific biological activity or function.
From Greek 'gala' (milk) + -in (chemical suffix). This combines the word for milk with a common suffix used in chemistry and biochemistry to denote a substance or compound.
Many milk-related proteins ending in -in were discovered in the late 1800s when scientists first started seriously analyzing milk chemistry—galactin is part of that era when milk seemed to contain magical healing substances.
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