| Description : |
Leukemia Inhibitory Factor (LIF) is a lymphoid factor which promotes long-term maintenance of embryonic stem cells by suppressing spontaneous differentiation. LIF has a number of other activities including cholinergic neuron differentiation, control of stem cell pluripotency, bone and fat metabolism, mitogenesis of certain factor dependent cell lines and promotion of megakaryocyte production in vivo. |
| Source : |
E. coli |
| Species : |
Human |
| Form : |
Lyophilized from a 0.2 μm filtered concentrated solution in PBS, pH 7.4. |
| Bio-activity : |
Fully biologically active when compared to standard. The specific activity determined by inducing differentiation of murine M1 myeloid leukemic cells. The minmun detectable concentration of rHuLIF in this assay is 0.5 ng/ml. The specific activity of >2×10^8 IU/mg, where 50 units is defined as the amount of rHuLIF required to induce differentiation in 50% of the M1 colonies in 1ml agar cultures. |
| Molecular Mass : |
19.7 kDa |
| AA Sequence : |
SPLPITPVNA TCAIRHPCHN NLMNQIRSQL AQLNGSANAL FILYYTAQGE PFPNNLDKLC GPNVTDFPPF HANGTEKAKL VELYRIVVYL GTSLGNITRD QKILNPSALS LHSKLNATAD ILRGLLSNVL CRLCSKYHVG HVDVTYGPDT SGKDVFQKKK LGCQLLGKYK QIIAVLAQAF |
| Endotoxin : |
Less than 1EU/μg of rHuLIF as determined by LAL method. |
| Purity : |
>98% by SDS-PAGE and HPLC analyses. |
| Usage : |
This material is for research, laboratory or further evaluation purposes. NOT FOR HUMAN USE. |
| Storage : |
This lyophilized preparation is stable at 2-8 centigrade, but should be kept at -20 centigrade for long term storage, preferably desiccated. Upon reconstitution, the preparation is stable for up to one week at 2-8 centigrade. For maximal stability, apportion the reconstituted preparation into working aliquots and store at -20 centigrade to -70 centigrade. Avoid repeated freeze/thaw cycles. |
| Reconstitution : |
We recommend that this vial be briefy centrifuged prior to opening to bring the contents to the bottom. Reconstitute in sterile distilled water or aqueous buffer containing 0.1% BSA to a concentration of 0.1-1.0 mg/mL. Stock solutions should be apportioned into working aliquots and stored at ≤ -20 centigrade. Further dilutions should be made in appropriate buffered solutions. |
