About hCG beta
This gene is a member of the glycoprotein hormone beta chain family and encodes the beta 3 subunit of chorionic gonadotropin (CG). Glycoprotein hormones are heterodimers consisting of a common alpha subunit and an unique beta subunit which confers biological specificity. CG is produced by the trophoblastic cells of the placenta and stimulates the ovaries to synthesize the steroids that are essential for the maintenance of pregnancy. The beta subunit of CG is encoded by 6 genes which are arranged in tandem and inverted pairs on chromosome 19q13.3 and contiguous with the luteinizing hormone beta subunit gene. [provided by RefSeq, Jul 2008]

About Alexa Fluor 680
Alexa Fluor™ 680 (AF680, Alexa 680) has an excitation peak at 679 nm and an emission peak at 702 nm, and is spectrally similar to Cy®5.5 (GE Healthcare), IR680® (Licor), iFluor® 680 (ATT Bioquest) and iFluor® 700 (ATT Bioquest). Alexa 680 is commonly used for flow cytometry, fluorescence microscopy and super-resolution microscopy.