Stem cells are the body's raw materials â cells from which all other cells with specialized functions are generated. Under the right conditions in the body or a laboratory, stem cells divide to form more cells called daughter cells. These daughter cells either become new stem cells (self-renewal) or become specialized cells (differentiation) with a more specific function, such as blood cells, brain cells, heart muscle or bone. No other cell in the body has the natural ability to generate new cell types.
(December 2011) (Learn how and when to remove this template message) The hangman's knot or hangman's noose (also known as a collar during the Elizabethan era) is a well-known knot most often associated with its use in hanging a person.
1 Bowline for tying a loop in the end of a rope, as around one's waist or to secure a ring or grommet. 2  The knot is also used as an anchor knot and is used in many knot systems that are used in mountainous terrain such as a highline or hauling system.n topology, a knot is a figure consisting of a single loop, abstracted from any physical rope or line, with any number of crossing or knotted elements. As such, it has no proper ends, and cannot be undone or untied. Various mathematical techniques are used to classify and distinguish knots.