Whether removed surgically, traumatically, or via autopsy; tissue samples to be reviewed by pathology will be processed to facilitate creation of microscopic slides. Slides are sheets of glass with mounted slices of tissue cut so thin that light shines through. Through staining, the pathologist can use a microscope to identify characteristics of the cells based on their shape and color. The formation of the cells and relationships with adjacent cells is how pathologists make such a precise diagnosis. How the large pieces of tissue are processed to create diagnostic slides is an interesting process involving many steps and various laboratory professionals.