A protein compound that contains non-protein components attached to it, such as a prosthetic group or coenzyme.
From Greek 'hetero-' (different) + 'proteid' (from Greek 'proteios', meaning of first importance). This biochemistry term emerged in the 19th century as scientists studied protein structure.
Hemoglobin, the protein that carries oxygen in your blood, is a heteroproteid—the 'heme' part (containing iron) is totally different from the protein part, but they work together perfectly.
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