Stage-specific embryonic antigen (SSEA)-5 is a pluripotency surface marker expressed in the blastocyst inner cell mass and on human pluripotent stem cells, including both human embryonic stem cells (hESCs) and human induced pluripotent stem cells (hiPSCs). Because SSEA-5 expression rapidly decreases upon differentiation, it can be used to identify undifferentiated pluripotent stem cells. SSEA-5 can be combined with other pluripotency surface markers (e.g. CD9/CD90 or CD50/CD200) to immunodeplete remaining pluripotent stem cells from incompletely differentiated cultures.
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.