Antibodies, Blocking Antibodies, Monoclonal, Humanized Antigens, CD Antineoplastic Agents BTLA BTLA protein, human CD160 CD160 protein, human CTLA-4 Coinhibitory receptors Cytokines DPT0O3T46P GPI-Linked Proteins HAVCR2 protein, human HIV Antigens HIV-1 Hepatitis A Virus Cellular Receptor 2 Immune checkpoints Immunologic Factors Ipilimumab Journal Article LAG-3 Lymphocyte Activation Gene 3 Protein PD-1 PDCD1 protein, human Programmed Cell Death 1 Receptor Receptors, Immunologic Research Support, Non-U.S. Gov't T cell exhaustion TIM-3