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.
As a new report says Generation Z are smarter and more prudent than Gen Y, here's a guide to all those complex generational labels. Malala Yousafzai, born in 1997, is a standard bearer for Gen Z Photo: AFP/Getty Images.