The Janus Kinase Family
The four JAK family members are:
- Janus kinase 1 (JAK1)
- Janus kinase 2 (JAK2)
- Janus kinase 3 (JAK3)
- Tyrosine kinase 2 (TYK2)
Transgenic mice that do not express JAK1 have defective responses to some cytokines, such as interferon-gamma. JAK1 and JAK2 are involved in type II interferon (interferon-gamma) signalling, whereas JAK1 and TYK2 are involved in type I interferon signalling. Mice that do not express TYK2 have defective natural killer cell function.
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