- Biology - Antibodies
- Each pathogen has a particular antigen 9proteins with a specific shape on its surface)
- Antibodies have a particulkar sapoe and o can lock onto a particular antigen.
- Immune system makes the right sort of antibodies to lock onto the antigens of a particular pathogen that is invading the body.;
- When the pathigen is coated with antibodies the white blood cells can ingest and kill the pathogens.