Relating to allotypes, which are genetic variations in antibodies or proteins that occur in different individuals of the same species.
From 'allotype' (allo- 'other' + -type 'form'), referring to immunological variants. This term became prominent in immunology during the mid-20th century as scientists studied protein differences.
Your antibodies are slightly different from your friend's at a molecular level—these allotypical differences are why some people's immune systems react differently to the same disease!
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