Different structures have different functions or purposes. The individual parts of any structure need to be selected, arranged and fixed together carefully to make sure the structure carries out its ...

The sequence of amino acids in the chain determines how the chain will fold up to make the protein, so different proteins have different three-dimensional shapes. The three-dimensional shape of a ...

A team of researchers has generated one of the most detailed 3D maps of human chromosomes, cataloging over 140,000 DNA looping interactions.

An essential component of the lymphatic system, the thymus, a pyramid-shaped organ located in the thoracic cavity, is responsible for producing T-cells. For centuries, the thymus was believed to be an ...

This article – the second in a six-part series on the gastrointestinal tract – describes the role of the stomach in chemical and mechanical digestion, regulation of hunger, eradication of pathogens ...