What is an antigen? Antigen refers to any foreign substance which on entering the body  stimulates the production of antibodies in the body of the  individual as a part of the immune response.
Gen Z Defined. Gen Z consumers range from ages 2 to 19, though the target range for marketers lies from ages 11 to 16. Gen Z is the most diverse and multicultural of any generation in the U.S. -- 55% are Caucasian, 24% are Hispanic, 14% are African-American and 4% are Asian. Gen Z Beliefs.
This is Generation Z, and they have never known a world without the Internet, cell phones or iPods. Experts disagree on when exactly Gen Z begins. Some argue that the inaugural members were born as early as 1991 and as late as 2001 [sources: Hawkins, Schmidt], while others contend that anyone born after 1995 is part of Gen Z [source: Walliker].