Serum is defined as an amber-coloured, protein-rich liquid which separates out when blood coagulates. Its alos a generic term used to explain cures or treatmenst that can help with an existing condition.
So for example the blood serum of an animal used to provide immunity to a pathogen or toxin by inoculation or as a diagnostic agent. ie"doctors treated the bites of carpet vipers with serum produced from local snakes"
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