| abstract |
The invention provides compositions electron-deficient nitrogen heterocycle-substituted fluorescein dyes and meth-ods in which the dyes are conjugated to substrates and used as detection labels in molecular biology experiments. The electron-de-ficient nitrogen heterocycles include pyridine, quinoline, pyrazine, and the like. Substrates include polynucleotides, nucleosides, nucleotides, peptides, proteins, carbohydrates, and ligands. |