text: 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 (the other members are JAK1, JAK2, and JAK3).  It has been implicated in IFN-α, IL-6, IL-10 and IL-12 signaling.