Most negative selection is thought to occur in the thymic medulla as this contains two types of specialized antigen-presenting cell — dendritic cells and thymic epithelial cells (TECs). Medullary TECs ...

Postcopulatory sexual selection (PCSS) arises from widespread sexual promiscuity and operates through competition of the ejaculates of different males over fertilization (sperm competition), choice of ...

Here's everything you need to know about Selection Sunday for the 2025 men's and women's college basketball NCAA Tournaments: Selection Sunday is the day when the NCAA Selection Committee announces ...

Natural selection is a mechanism of evolution. Organisms that are more adapted to their environment are more likely to survive and pass on the genes that aided their success. This process causes ...