The TRA-1-81 monoclonal antibody reacts with a pluripotent-stem-cell-specific antigen expressed upon the surface of human embryonic stem (ES) cells, embryonal carcinoma (EC) cells, and embryonic germ (EG) cells. The expression of TRA-1-81 antigen is stage-specific; as human EC and ES cells undergo differentiation, expression of TRA-1-81 antigen is lost, making it a widely used marker to characterize human ES cells and to monitor their differentiation. TRA-1-81 antibody recognizes a carbohydrate epitope expressed on podocalyxin, a sialoglycoprotein structurally related to CD34. Podocalyxin is a transmembrane glycoprotein which has been implicated in the development of aggressiveness in a variety of cancers, including breast and prostate cancer. For use on live cells, this antibody has been specifically formulated with low endotoxin and no sodium azide. ES cell morphology, proliferation, and expression of pluripotency markers does not change after staining with this antibody.
ICC analysis of TRA-1-81 antibody on primary human iPS cell colonies generated by reprogramming with mRNA. Phase contrast view of cells in culture and the same field of view after staining with StainAlive TRA-1-81 Antibody (DyLight 488) using a 1:100 dilution. [A] Phase contrast view of cells in culture, [B] same field of view after staining with StainAlive TRA-1-81 Antibody (DyLight 488) using a 1:100 dilution.
StainAlive TRA-1-81 Antibody (DyLight 488), Mouse anti-Human
Phosphate-buffered solution, pH 7.2, containing no preservative
Storage and Stability
Store at 4 °C protected from light. Do not freeze. Handle under aseptic conditions. Stable for 6 months from date of receipt when stored as directed.
Tested by immunocytochemistry to ensure product quality. Endotoxin level is less than 0.1 EU/µg (0.01 ng/µg) of the protein as determined by the LAL assay.
The suggested use of this antibody is a 1:100 dilution for immunocytochemistry. For an application specific protocol, please see General Protocol for ICC Staining of Live Cells
Mouse IgM, κ
Human embryonal carcinoma cell line 2102Ep
This antibody was purified by affinity chromatography and conjugated with DyLight 488 under optimal conditions. The solution is free of unconjugated dye and unlabeled antibody. 0.2 µm filter sterilized. Formulation is free from bacteria, fungi, mycoplasma, and mouse virus