About one third of all of the protein in your body is collagen. Collagen is a major structural protein, forming molecular cables that strengthen the tendons and vast, resilient sheets that support the skin and internal organs. Bones and teeth are made by adding mineral crystals to collagen.
User-generated content. User-generated content (UGC), alternatively known as user-created content (UCC), is any form of content created by users of a system or service and made available publicly on that system.
Gravitational potential energy (Ug), potential energy associated with gravitational force Utility graph, a mathematical graph used in the water, gas, and electricity problem Siemens NX, formerly known as NX Unigraphics or usually just UG, is an advanced high-end CAD/CAM/CAE software package User guide or user's guide, an instruction manual Other uses