Fact 1: Antibodies are large, Y-shaped proteins that recognize and bind to antigens.

Fact 2: ALL immunogens are antigens.

Given the two facts above, answer the question "Antibodies are large, Y-shaped proteins that recognize and bind to" with the following options: 
- humans
 - positive
 - immunogens
 - animals
 - A Greek letter
 - protect them
 - Allergies
 - the skin


 

   immunogens      