JAKi and TYK2i: What/when to use? You can see that the JAKi/TYK2i have both approved or potential seropositive and seronegative indications. There are also improvements in PsO for the class and studies in CTDs. It is difficult to know which to choose https://t.co/uid38oFBXP https://t.co/gLJfJNi2Jh