Are There Any Biomarkers for Long COVID?

Are there any biomarkers that shed light on who has which mechanism or bunch of mechanisms going on in their body? Lots of labs, including ours all over the world, knew that this was a good thing to do. And if you put together all of those analyses, there's some common themes emerging. I don't feel confident yet there'll be a catch all answer that helps everyone, but I think we're on the way.