A lack of response to an antigen or antibody.(noun)
Lack of energy(noun)
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Use "anergy" in a sentence
"As I originally wrote in my 1993 book, "Scientists recently discovered a process in the body's immune system called "anergy.""
"In utero bone marrow transplantation induces tolerance by a combination of clonal deletion and anergy."
"Ongoing studies involve cell-cycle regulation, novel transcription factors and regulation of key genes involved in T cell anergy and tolerance, including Foxp3 and its various homologs; further details are available."