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As the vital components of immune homeostasis, immune checkpoint molecules downregulate magnitude of immune response and participate in peripheral tolerance [5]

Bradford N (1976) A rapid and sensitive method for the quantitation microgram quantities of a protein isolated from red cell membranes

Tamminga CA, Holcomb H

[108] A 2021 report by the New South Wales Government (NSW Health) in Australia found that the Pfizer-BioNTech vaccine is safe for those with various forms of immunodeficiency or immunosuppression, though it does note that the data on said groups is limited, due to their exclusion from many of the vaccine earlier trials held in 2020

[DOI] [PubMed] [Google Scholar] 38.Sun XQ, Fu XB, Zhang R-, L Y, Deng Q, Jiang XG, Sheng ZY