My current wallpaper. To remind me the existence on antigen A or antigen B on RBC and the invisible yet important interleukins, MHC class I and other soluble protein. A good note to remind me in type II hypersensitivy, drug bind to RBC first then being targeted by antibodies. A reminder that some pathogen can be extracellular and intracellular and RBC is one of their major target by hemolysins.
my own of way of revision :D