Cytotoxic T-lymphocyte antigen 4 (CTLA4) is a co-receptor expressed by activated, memory T cells and regulatory T cells 1,2,3,4,5,6. It is a homodimer that can bind to the homodimeric ligands CD80 ...
The only letter I’ve ever sent to the New York Times was in the 1980s, objecting to the paper’s suddenly pestilent use of “draconian.” During Iran–Contra the complaint must have seemed trivial; the ...
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