CD4 + CD8 + double-positive (DP) thymocytes undergo one of three fates in the thymus: positive selection, negative selection or death by neglect. Negative selection of thymocytes that express T-cell ...

Natural selection is usually understood in the context of change. When organisms deviate from the norm, they may gain advantages that let their lineages outlast those of their less-adaptable relatives ...

When most people think about natural selection, they imagine individuals competing with one another: The fastest animal escapes predators, the strongest plant produces more seeds, and the most ...

March Madness is already in full swing, thanks to a wild stretch of conference tournament games. On Sunday evening, we'll finally have a bracket, as the 68-team field will be revealed during the ...

With the regular season in the books and conference tournaments into the meat of their brackets during Champ Week, that can only mean Selection Sunday is quickly approaching. For those that may not be ...

Your institution does not have access to this book on JSTOR. Try searching on JSTOR for other items related to this book. Levels of Selection: Burying the Units-of-Selection Debate and Unearthing the ...

Hiring the right employees is crucial for any business, but small businesses can afford an even narrower margin of error when it comes to selection than larger ...