People with certain variations in nicotine - receptor genes face a greater risk of becoming hooked on cigarettes into adulthood. (sciencemag.org)
Are people with certain variations in hip structure at higher risk for yoga injuries to the hip? (yogauonline.com)
The critical part is that each faction behaves like the last, with only certain variations added to their groups, but they're all, ultimately, the same kind of enemy. (darkstation.com)