Tetrazine Reagents in Click Chemistry are reactive compounds that contain a tetrazine ring, which can undergo rapid and efficient reaction with trans-cyclooctene (TCO)-containing molecules through a strain-promoted alkyne–azide cycloaddition (SPAAC) mechanism, providing a bioorthogonal conjugation strategy. These reagents are particularly valuable for labeling biomolecules with minimal interference from biological systems, offering advantages in live-cell imaging, targeted drug delivery, and proteomics. Tetrazine reagents enable highly selective, fast, and efficient covalent bonding to TCO-modified targets, facilitating applications in molecular diagnostics, in vivo tracking, and therapeutic development.
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