Four main processes are responsible for the development of the nervous system: cell proliferation, the process in which nerve cells divide to form new generations of cells ; cell migration, the process in which nerve cells move from their place of origin to the place where they will remain for life ; cell differentiation, the process during which cells acquire individual characteristics ; and cell death, a natural process in which cells die.

According to a tradition reported both by Sahih al-Bukhari and Sahih Muslim, Muhammad is reported to have said: " Four characteristics are such that if a person has all the four in him, he is beyond any doubt a hypocrite, and the one who has one of these, is a hypocrite to that extent till he gives it up:

Four allotropes of antimony are known, a stable metallic form and three metastable forms, explosive, black and yellow.

Gale Owen-Crocker ( Professor of Anglo-Saxon, University of Manchester ) in The Four Funerals in Beowulf ( 2000 ) argues that a passage in the poem, commonly known as “ The Lay of the Last Survivor ” ( lines 2247 – 66 ), is an additional funeral.

Four of the most notable English Abbeys are the Basilica of St Gregory the Great at Downside, commonly known as Downside Abbey, Ealing Abbey in Ealing, West London and St. Lawrence's in Yorkshire ( Ampleforth Abbey ) and Worth Abbey which has appeared in two BBC2 TV programmes ; ' The Monastery ( BBC TV series )' and ' The Big Silence '.

Soon after this he decided, as all successful people must decide at some time or another, to be his own boss again-and he has been that ever since .’ these notes fail to account for his early band, known as the Four Aces of Western Swing.

The longest and best known of these is " El Curioso Impertinente " ( the impertinently curious man ), found in Part One, Book Four.

This situation continued under the rule of his father Vespasian, who became emperor in 69 following the civil war known as the Year of the Four Emperors.

Chaos ensued, leading to a year of brutal civil war known as the Year of the Four Emperors, during which the four most influential generals in the Roman Empire — Galba, Otho, Vitellius and Vespasian — successively vied for imperial power.

In an address known as the Four Freedoms speech ( technically the 1941 State of the Union address ), he proposed four fundamental freedoms that people " everywhere in the world " ought to enjoy:

The best known song to come out of the series was " Four Feather Falls ", sung in some episodes by Michael Holliday in the style of Bing Crosby.

Kohl is best known for orchestrating reunification with the approval of all the Four Powers from World War II, who still had a voice in German affairs.

While there was a Carthaginian Senate, the real power was with the inner " Council of 30 Nobles " and the board of judges from ruling families known as the " Hundred and Four ".

Not much is known of the early years of the team, but when Havok began to have an affair with Sue Storm of the Fantastic Four, Havok's wife Madelyne came running to Ice-Man.

* 68 – Roman Emperor Nero commits suicide, after quoting Homer's Iliad, thus ending the Julio-Claudian Dynasty and starting the civil year known as the Year of the Four Emperors.

The album remained officially untitled and is most commonly known as Led Zeppelin IV, though it is variously referred to as Untitled, IV, or after the four symbols appearing on the record label, as Four Symbols, Zoso or Runes.

* The cities of the Ancestral Pueblo ( or Anasazi ) culture, located in the Four Corners region of the Southwest United States – The best known are located at Chaco Canyon and Mesa Verde.

Four stars of this constellation ( α, β, γ, δ Lep ) form a quadrilateral and are known as ‘ Arsh al-Jawzā ', " the Throne of Jawzā '" or Kursiyy al-Jawzā ' al-Mu ' akhkhar, " the Hindmost Chair of Jawzā '" and al-Nihāl, " the Camels Quenching Their Thirst " in Arabic.

In Mitchell's teenage years, she is known to have written a 400-page novel about girls in a boarding school, The Big Four.

For Americans the term is most known from the opening of the Gettysburg Address: " Four score and seven years ago, our forefathers ...".

His death ended the Julio-Claudian Dynasty, sparking a brief period of civil wars known as the Year of the Four Emperors.

To an extent this oligopoly is enshrined in law in what is known as the " Four pillars policy ", in order to ensure the stability of Australia's banking system.

* The accountancy market is controlled by PriceWaterhouseCoopers, KPMG, Deloitte Touche Tohmatsu, and Ernst & Young ( commonly known as the Big Four )

The third is the astrological treatise known sometimes in Greek as the Apotelesmatika ( Ἀποτελεσματικά ), more commonly in Greek as the Tetrabiblos ( Τετράβιβλος " Four books "), and in Latin as the Quadripartitum ( or four books ) in which he attempted to adapt horoscopic astrology to the Aristotelian natural philosophy of his day.

His astrological treatise, a work in four parts, is known by the Greek term Tetrabiblos, or the Latin equivalent Quadripartitum: ‘ Four Books ’.

Four months later, it was known throughout the Alpha Quadrant as a very thought-provoking piece of work.

Nijmegen is famous for the International Four Day March Nijmegen (, informally Nijmeegse Vierdaagse ), an annual event starting on the third Tuesday in July, comprising four days of walking ( distances ranging from 30 to 50 km a day ), and the accompanying festivities ( the Vierdaagsefeesten including the independent festival de-Affaire ), which have been drawing the largest crowds for any Dutch event in the past few years.

The flag of Sardinia is informally known as the Four Moors (,, ) and comprises four Moor heads.

The Fourth Division was also known as Division Four, or informally as the " basement division " of English football, a moniker retained by its successors.

The so-called " Four Field Approach " has its origins in Boasian Anthropology, dividing the discipline in the four crucial and interrelated fields of sociocultural, biological, linguistic, and archaic anthropology ( e. g. archaeology ).

Four rings of gold are to be attached to its four feet — two on each side — and through these rings staves of shittim-wood overlaid with gold for carrying the Ark are to be inserted ; and these are not to be removed.

It was founded by four senior Labour Party ' moderates ', dubbed the ' Gang of Four ': Roy Jenkins, David Owen, Bill Rodgers and Shirley Williams.

At Phnom Penh four major water courses meet at a point called the Chattomukh ( Four Faces ).

Image: The four trees -- Claude Monet -- 1891 -- oil on canvas -- 82 x 81. 5 cm -- the Metropolitan Museum of Art -- four poplars on the banks of the Epte River near Giverny. jpg | Four Poplars on the Banks of the Epte River near Giverny, 1891, Metropolitan Museum of Art

Four pitchers, including presumed game four starter Jaret Wright, surrendered nine runs in relief.

* The Four Great Books of Song, a term referring to the four large compilations during the beginning of Song Dynasty.

( model 6065, 1977 ): Four variations on Kee Games ' Tank, four fixed joysticks ( two per player ), uses a General Instruments AY-3-8700 Tank chip.

The highest auction record for the artist was set on November 6, 2007 at Christie's in New York, where a group of four paintings, " Les Quatre Saisons " ( the Four Seasons ) sold for $ 14, 601, 000 ( estimate $ 12, 000, 000-$ 18, 000, 000 ).

Four female writers of the Golden Age are considered the four original " Queens of Crime ": Christie, Dorothy L. Sayers, Ngaio Marsh and Margery Allingham.

As well as the friars, Dominican sisters live their lives supported by four common values, often referred to as the Four Pillars of Dominican Life, they are: community life, common prayer, study and service.

Two troops of British cavalry, one at the Four Courts, the other on O ' Connell Street, sent out to investigate what was happening, took fire and casualties from rebel forces On Mount Street, a group of reserve volunteer soldiers, stumbled upon the rebel position and four were killed before they reached Beggars Bush barracks.

President Roosevelt ’ s Four Freedoms speech inspired a set of four Four Freedoms paintings by Norman Rockwell.

In the opening sequence of the first game, the Four Freedoms are displayed in text version as a splash screen at the opening of the game, with a fifth freedom added: The freedom to protect the other four — by any means necessary.

Four years later, four nations met in Geneva and formed the organization which has grown into the Red Cross, with a key stated aim of " aid to sick and wounded soldiers in the field ".

* Four pillars policy, a legislative policy of the Government of Australia to maintain the separation of four of the largest banks in Australia by disallowing their merger or acquisition by any of the other three banks

The first four structures, today dubbed " The Original Four ," " around a lawn " were understood as a clear reference to the buildings around The Lawn of the University of Virginia in Charlottesville.

Eidolon is supported by his four generals, themselves a reference to the Four Horsemen of the Apocalypse.

Alasdair Gray's Lanark: A Life in Four Books consists of four books arranged in the order 3, 1, 2, 4 ; books 1 and 2 constituting a Künstlerroman.