Non-receptor tyrosine-protein kinase TYK2 is an enzyme that in humans is encoded by the TYK2 gene. TYK2 was the first member of the JAK family that was described. It has been implicated in IFN-α, IL-6, IL-10 and IL-12 signaling. From Wikipedia
Preclinical studies show promise for repurposing an FDA-approved psoriasis drug to protect insulin-producing beta cells and reduce autoimmune inflammation.