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A fluorescently modified CD4 domain 1 (mD1) protein has been designed and elaborated in an in vitro expression system. This fluorescent probe contains a Förster resonance energy transfer (FRET) pair, which uses a tryptophan residue as the fluorescence donor and an acridon-2-ylalanine (Acd) as the acceptor. When excited at 260nm, energy was transferred from tryptophan to the Acd residue of mD1, and...
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