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The first JAK kinase inhibitor to be developed, tofacitinib, inhibits JAK1 and JAK3. These two JAK kinases are required for the signaling pathways induced by multiple cytokines, including all of the receptors that share the cytokine receptor common gamma chain ( c; includes the receptors for IL-2, IL-4, IL-7, IL-9, IL-15, and IL-21) , all of the receptors that share gp130 (includes the receptor for IL-6) , the receptors for GM-CSF, IL-12, and IL-23, and both type I and type II (i.e., IFN- ) interferon receptors. Tofacitinib has recently been shown to be effective in the treatment of severe rheumatoid arthritis, an autoimmune disease characterized by inflammation of the joints with prominent inflammatory cell infiltrates, autoantibodies, and eventual cartilage and bone destruction. A likely explanation for the therapeutic benefits of tofacitinib in this disease is:
Direct Price Discrimination
A pricing strategy where a seller adjusts prices for different customers based on observable personal characteristics or willingness to pay.
Elastic Demand
A situation where the demand for a good or service greatly changes in response to changes in price.
Direct Price Discrimination
A pricing strategy where a seller charges different prices to different customers for the same product or service, based on their willingness to pay.
Inelastic Demand
A situation in which demand for a good or service is barely affected by changes in price.
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