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.
After the war came the Baby Boomers. And now researchers have identified Generation Z, born since 1995. Young people growing up amid the war on terror with the internet on tap are more prudent, thoughtful and socially aware than their elders, say experts.