A protein molecule that has been chemically linked with an azo dye or azo compound.
From 'azo-' (nitrogen compound) + 'protein' (amino acid chain), created in the late 19th century by biochemists studying how dyes bind to proteins in textile manufacturing and laboratory research.
Azoprotein was crucial in early immunology experiments—scientists could attach colored azo dyes to proteins and literally watch them move through tissues under a microscope, making invisible biology visible for the first time.
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