About CXCR4
This gene encodes a CXC chemokine receptor specific for stromal cell-derived factor-1. The protein has 7 transmembrane regions and is located on the cell surface. It acts with the CD4 protein to support HIV entry into cells and is also highly expressed in breast cancer cells. Mutations in this gene have been associated with WHIM (warts, hypogammaglobulinemia, infections, and myelokathexis) syndrome. Alternate transcriptional splice variants, encoding different isoforms, have been characterized. [provided by RefSeq, Jul 2008]

About Fluorescein
Fluorescein is an organic fluorophore first synthesized by Aldolf Bayer in 1871. FITC, an amine-reactive derivative, is also a commonly used name for this dye. It has an excitation peak at 494 nm and an emission peak at 512 nm.