The synthesis of oligonucleotides containing a novel nucleobase fluore
scent derivative 5-NH2-(carboxyfluorescein)-2'-deoxyuridin in which th
e chromophore fluorescein is directly linked to nucleobase of 2'dU at
C-5 via an amido function is described. The fluorescent oligonucleotid
es have been used as primers for PCR amplification of Human beta-globi
n gene fragment. Oligonucleotides containing multiple biotechnology.