Caption: Schematic representation of some proteins of the immunoglobulin (Ig) superfamily.
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 14.70 MB

Caption: The basic structure of a typical T-cell antigen receptor
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 36.16 MB

Caption: In the US, vaccination programs have almost eradicated diphtheria, polio, and measles. Data source: U.S. Bureau of the Census.
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 24.90 MB

Caption: HIV-1 virus
Artist: Laguna Design
Release: Not Applicable
File Size: 53.64 MB