An older spelling or variant name for adenine, one of the four nitrogenous bases that form the building blocks of DNA.
From Greek 'aden' (gland) + '-in' (chemical suffix). This was an earlier terminology before 'adenine' became the standard international spelling.
Adenine was named when scientists first isolated it from glandular tissue and before they understood it was one of the four magical letters (A, T, G, C) that spell out the entire genetic code!
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