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Our Abpromise guarantee covers the use of ab50051 in the following tested applications.
Biological Activity : The ED50 as determined by its ability to inhibit the proliferation of murine MPC-11 cells is < 2 ng/ml, corresponding to a specific activity of > 5 x 105 units/mg.
Shipped at 4°C. The lyophilized protein is stable for a few weeks at room temperature. Store at -20°C long term.
Constituent: 0.2941% Sodium citrate
This product is an active protein and may elicit a biological response in vivo, handle with caution.
Human embryonic stem cells (HUES4) were differentiated as monolayer cultures on matrigel coated dishes using a protocol described in Kroon et al, Nat Biotechnol. (2008). Activin A (ab50051) and Wnt3a (ab81484) were added to cultures to direct differentiation towards definitive endoderm. This image was taken 3 days after induction, where the definitive endoderm marker FOXA2 (ab40874 in green) is abundant. Dapi staining is shown in blue. Magnification: 200x. Negative controls of fluorescently conjugated secondary antibodies only showed no staining.