Follistatin belongs to a group of structurally-diverse diffusible proteins that binds to TGF-beta ligands and inhibit their activity by hindering access to signaling receptors. This naturally occurring antagonist binds to Activin, BMP-2,-4,-6,-7, Myostatin, GDF-11, and TGF-b1. Follistatin is expressed in the pituitary, ovaries, decidual cells of the endometrium, and in some other tissues. ||Source:|Recombinant protein corresponding to 288aa including 36 cysteine residues from human Follistatin, expressed in E. coli. ||Molecular Weight: |~31.5kD||Biological Activity:|Determined by its ability to neutralize Activin A inhibitory effect of murine MPC-11 cells. The expected ED50 is 0.1-0.4ug/ml in the presence of 7.5ng/ml Activin A.||Endotoxin:|<0.1ng/ug||Storage and Stability:|Lyophilized powder may be stored at -20°C. Reconstitute with sterile dH2O. Aliquot to avoid repeated freezing and thawing. Store at -20°C. Reconstituted product is stable for 6 months at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.

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