pEYFP-Mem encodes a fusion protein consisting of the N-terminal 20 amino acids of neuromodulin,also called GAP-43, and a yellow-green fluorescent variant of the enhanced green fluorescent protein (EGFP). The neuromodulin fragment contains a signal for posttranslational palmitoylation of cysteines 3 and 4 that targets EYFP to membranes. The EYFP gene contains four amino acid substitutions previously published as GFP-10C. The fluorescence excitation maximum of EYFP is 513 nm, and the emission maximum is 527 nm (in the yellow-green region).