The CH3A4A7 monoclonal antibody reacts with an extracellular epitope on human CD344 which is also known as Frizzled family receptor 4 (FZD4) or Frizzled-4. CD344 is a member of the Frizzled family of proteins within the G protein-coupled receptor (GPCR) superfamily. CD344 is a receptor for Wnt proteins and participates in the activation of the Wnt/beta-catenin pathway (canonical Wnt signaling). Patients with familial exudative vitreoretinopathy (FEVR) carry mutations in Frizzled-4. This disease is characterized by retinal degeneration and hearing loss. On tissues, CD344 is almost ubiquitously expressed. CD344 is highly expressed in adult heart and skeletal muscle.
The antibody was conjugated to BD Horizon™ BV650 which is part of the BD Horizon Brilliant™ Violet family of dyes. This dye is a tandem fluorochrome of BD Horizon BV421 with an Ex Max of 405-nm and an acceptor dye with an Em Max at 650-nm. BD Horizon BV650 can be excited by the violet laser and detected in a filter used to detect APC-like dyes (eg, 660/20-nm filter). Due to the excitation and emission characteristics of the acceptor dye, there will be spillover into the APC and Alexa Fluor® 700 detectors. However, the spillover can be corrected through compensation as with any other dye combination.