14.Holographic data-storage devices, unlike their refrigerator-size ancestors, looked more like sleek stereo components, each perched atop a columnar pedestal.
15.This causes the epithelium of the lower esophagus to constantly renew, and when it's replaced by columnar epithelium, that's called Barrett's esophagus.
17.In chronic laryngitis the normal columnar cells undergo dysplasia, which is when they transform into squamous epithelium to adapt to the chronic irritation.