glutathione s transferase 4 S-transferase: A versatile and dynamic enzyme Transferase (GST) Assay Kit is designed to measure total GSTactivity Glutathione S-transferase A1 - Wikipedia
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By exhibiting many phenotypic characteristics, macrophages often behave as immunosuppressive cells in the tumor microenvironment [61]

Attoub S, Hassan AH, Vanhoecke B, Iratni R, Takahashi T, Gaben AM, et al

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This may contribute to its observed effect durability
