A special receptor (FcRn) saves antibodies from being destroyed inside cells and helps shuttle them — along with any germs they’re attached to — to the right place to be shown to immune cells.

This study shows that when antibodies (IgG) grab onto germs, special cell receptors help bring them inside the cell and send them to the right place to teach immune cells what to attack—supporting the idea that IgG helps present threats to the immune system.