Just returned from a tiring 10 day trip
most of which was in an area so remote there wasn't internet access. Am
totally wiped out, but I can tell you that your question, an important one, has no simple answer. There are many different subsets of Tcells and their numbers fluctuate up and down independently for the most part ,it seems.
If I find a good review article on this or particularly pertinent items, I will try to post them.
Til then...
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