Purity ~99% (RP-HPLC, SDS-PAGE). Source: Recombinant protein corresponding to mouse NGF-beta expressed in Submaxillary Gland of Grown Mouse. Molecular Weight: ~13.47kD Biological Activity: Measured in a cell proliferation assay using a factor-dependent human erythroleukemic cell line, TF-1, the ED50 for this effect is typically 0.3-1ng/ml. Specific Activity: 1x10e6IU/mg. AA Sequence: The sequence of the first five N-terminal amino acids was determined and was found to be Ser-Ser-Thr-His-Pro.