Recombinant Human LIF is a lymphoid factor that promotes long-term maintenance of the pluripotency of embryonic stem cells by suppressing spontaneous differentiation1,2. Leukemia Inhibitory Factor (LIF) has additional functions such as cholinergic neuron differentiation, bone and fat metabolism, mitogenesis of certain factor dependent cell lines and promotion of megakaryocyte production in vivo3. Human LIF is an approximate 20 kDa protein containing 202 amino acid residues and is active on both human and mouse cells.
Stemfactor LIF, Human Recombinant
1mL, 10µg/mL 1mL, 100µg/mL
Greater than 99% by SDS-PAGE analysis.
LIF is supplied as a 0.22µm sterile filtered liquid in PBS containing 1% w/v BSA as carrier.
Storage and Stability
Store LIF at 4°C. Do not freeze. Stable for up to 6 months from date of receipt, when stored as directed.
1mL, 10µg/mL (Cat. No. 03-0016) 1mL, 100µg/mL (Cat. No. 03-0016-100)
Less than 1 EU/µg of LIF as determined by the LAL method.
Human LIF activity is assessed by its ability to induce differentiation of M1 myeloid leukemia cells. The specific activity is 1 × 106units/mL (Cat. No. 03-0016) and 1 × 107units/mL (Cat. No. 03-0016-100), where 50 units is defined as the amount of human LIF required to induce differentiation in 50% of the M1 colonies in 1mL of medium.