About CD200
This gene encodes a type I membrane glycoprotein containing two extracellular immunoglobulin domains, a transmembrane and a cytoplasmic domain. This gene is expressed by various cell types, including B cells, a subset of T cells, thymocytes, endothelial cells, and neurons. The encoded protein plays an important role in immunosuppression and regulation of anti-tumor activity. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Jan 2016]

About eFluor 660
eFluor™ 660 (eF660) from Thermo Fisher Scientific has an excitation peak at 633 nm and an emission peak at 669 nm. It is useful in fluorescence microscopy and flow cytometry applications.