SNP genotyping is the measurement of genetic variations of single nucleotide polymorphisms (SNPs) between members of a species. It is a form of genotyping, which is the measurement of more general genetic variation.
On most plays, the center will snap the ball directly into the quarterback's hands. In a shotgun formation, the center snaps the ball to the quarterback lined up several yards behind him.
For the scoring play, see Safety (gridiron football score). For the topic of football medical safety, see Health issues in American football. Safety (S) is a position in American and Canadian football, played by a member of the defense. The safeties are defensive backs who line up from ten to fifteen yards in front of the line of scrimmage. There are two variations of the position in a typical American formation, the free safety (FS) and the strong safety (SS).