The branch of biology that studies the chemical composition and chemical reactions within cells, using staining and analytical techniques.
From Greek 'kytos' (cell) + 'chemistry.' Established as a distinct field in the early 1900s when microscopy met analytical chemistry.
Cytochemistry pioneers used colored dyes that bind to specific molecules—basically creating a chemical treasure map inside cells—and this technique was so powerful it became the foundation for immunofluorescence imaging that scientists still use today!
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