What is Proteins released by plasma cells that mark antigens for destruction phagocyte or complement?

The proteins released by plasma cells that mark antigens for destruction by phagocytes or complement are called antibodies. Antibodies are specialized proteins that can bind to specific antigens and help to neutralize or destroy them. When an antigen is introduced into the body, plasma cells produce antibodies that are specifically designed to bind to that antigen. These antibodies can then bind to the antigen and mark it for destruction by phagocytes, which are cells that engulf and destroy foreign particles. Additionally, antibodies can activate the complement system, a complex network of proteins that work together to destroy antigens.