The processing requirements include successful completion of: 1  The application process, which includes a background and polygraph examination, a medical examination, a physical fitness evaluation, and a written examination; 2  24-26 weeks of intensive Academy training.
The cell membrane, being exposed to the outside environment, is an important site of cell-cell communication. As such, a large variety of protein receptors and identification proteins, such as antigens, are present on the surface of the membrane.
An MHC protein serves as a recognizable scaffold thatpresents pieces (peptides) of a foreign protein (antigenic) to immune cells.An empty ï¬foreignï¬ MHC scaffold itself can act as an antigen when donor organs or cells areintroduced into a patientâ¢s body.