pEYFP-Golgi encodes a fusion protein consisting of enhanced yellow fluorescent protein (EYFP) and a sequence encoding the N-terminal 81 amino acids of human beta 1,4-galactosyltransferase (GT). This region of human beta 1,4-GT contains the membrane-anchoring signal peptide that targets the fusion protein to the trans-medial region of the Golgi apparatus. The EYFP gene contains the four amino acid substitutions previously published as GFP-10C. The fluorescence excitation maximum of EYFP is 513 nm; the emission spectrum has a peak at 527 nm (in the yellow-green region). When excited at 514 nm, the Em of EYFP is 84,500 cm-1M-1 and the fluorescence quantum yield is 0.61, resulting in a bright fluorescent signal. The fluorescence observed is roughly equivalent to that of EGFP.