CK-12 Foundation
Ck 12: Life Science: Lymphatic System
[Free Registration/Login may be required to access all resource tools.] If pathogens get through the body's first two lines of defense, a third line of defense takes over. This third line of defense involves the immune system. The immune...
CK-12 Foundation
Ck 12: Life Science: 11.22 Lymphatic System
Explore the structure and function of the lymphatic system.
CK-12 Foundation
Ck 12: Life Science: 11.62 Humoral Response
Learn about the human body's immune response to pathogens.
Stanford University
Stanford University: Bacterial Disease Research
Read about cutting-edge research on bacterial pathogens from the Stanford University. Then view movies showing how these pathogens invade their hosts. The introduction for the non-biologist is very helpful.
Other
Antibody Resource Page
A very interesting molecular model of an antibody. Not much information is given, but the ribbon structure itself is worth a look.