Answer Happy

Which of the following statements is false?
Group of answer choices
Professional antigen-presenting cells present exogenous antigens
using MHC class II molecules, and do not present endogenous
antigens using MHC class I molecules.
MHC class I molecules are antigen presenting glycoproteins
involved in the endogenous pathway to show cell’s identity for
immune surveillance.
Immune checkpoint inhibitors are proteins that block negative
immune checkpoints to enable the immune system to destroy cancer
cells.
Immune checkpoints are regulators of the immune system. These
pathways are crucial for self-tolerance, which prevents the immune
system from attacking its own cells indiscriminately.