An alternative or variant spelling of 'hapten,' referring to a small molecule that needs to bind to a larger molecule to trigger an immune response.
A variant spelling of 'hapten,' from Greek 'haptein' meaning 'to fasten.' Different scientists and languages used slightly different spellings in the early 20th century before standardization.
You'll mostly see 'hapten' in modern scientific literature, but 'haptene' appears in older immunology textbooks and European sources—it's a great example of how scientific terminology gets standardized over time.
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