Atopy is a predisposition toward developing certain allergic hypersensitivity reactions. Atopy may have a hereditary component, although contact with the allergen or irritant must occur before the hypersensitivity reaction can develop.
As of 2012, 63.9 percent of players playing in Major League Baseball are white. There is no way of telling the exact number due to the number of players.
The Brewers lead the Majors with 14 foreign-born players from seven countries and territories: Canada, Cuba, the Dominican Republic, Japan, Mexico, Puerto Rico and Venezuela. The Rangers have the second most, with 13, while the Rockies, Tigers and Giants each have 12 players born outside the United States. The Blue Jays' Opening Day roster featured seven Dominican players, the most from one nation outside of the U.S. The data takes into account the 856 players on Major League active 25-man rosters (750) and disabled or restricted lists (106) as of March 31. Adam Berry is a reporter for MLB.com.