This may take a few seconds ...

Cytotoxic T lymphocytes (CTLs) recognize peptides from foreign antigens that are presented by major histocompatibility complex (MHC) class I molecules. Antigens are degraded in the cytosol by ...

CD1 molecules present foreign and self lipids to diverse T cells and natural killer T (NKT) cells. Whereas the clonally restricted diverse T cells mediate adaptive immunity to microbial lipid antigens ...

Bystander video footage has captured the moments before the killing of 37-year-old Minneapolis man Alex Pretti by federal immigration officers. The confrontation and altercation which led to Pretti's ...