The exact role of a tissue in an organism depends on what types of cells it contains. For example, the endothelial tissue that lines the human gastrointestinal tract consists of several cell types.

Because of cell signaling, tissues have the ability to carry out tasks no single cell could accomplish on its own. Different types of tissues, such as bone, brain, and the lining of the gut ...

An analysis of a 30,000-year-old fossil vulture from Central Italy has revealed for the first time that volcanic rock can preserve microscopic details in feathers -- the first ever record of such a ...