Glutamate receptors are one of four categories, three of which are ligand-gated ion channels and one of which is a G-protein coupled receptor ( often referred to as GPCR ).

Cellular signaling by adenosine occurs through four known adenosine receptor subtypes ( A1, A2A, A2B, and A3 ).

These four receptor subtypes are further classified based on their ability to either stimulate or inhibit adenylate cyclase activity.

The structure includes four helices necessary for functional interaction with the GH receptor.

The exact mechanism of action is unknown, but four properties that may contribute to topiramate's antiepileptic and antimigraine efficacy include a blockage of voltage-dependent sodium channels, an augmentation of gamma-aminobutyrate acid activity at some subtypes of the GABA-A receptors, antagonism of AMPA / kainate subtype of the glutamate receptor, and inhibition of the carbonic anhydrase enzyme, particularly isozymes II and IV.

The adhesins are four trichomonad enzymes called AP65, AP51, AP33, and AP23 that mediate the interaction of the parasite to the receptor molecules on VECs.

The glands, usually four in number, contain the parathyroid chief cells that sense the level of calcium in the blood through the calcium-sensing receptor and secrete parathyroid hormone.

It is additionally the means for further InsP3 receptor diversity in that it has as many as four splice sites with as many as 9 different optional exons or exon variants.

The epidermal growth factor receptor is a member of the ErbB family of receptors, a subfamily of four closely related receptor tyrosine kinases: EGFR ( ErbB-1 ), HER2 / c-neu ( ErbB-2 ), Her 3 ( ErbB-3 ) and Her 4 ( ErbB-4 ).

There are five types of kainate receptor subunits, GluR < sub > 5 </ sub > (), GluR < sub > 6 </ sub > (), GluR < sub > 7 </ sub > (), KA1 () and KA2 (), which are similar to AMPA and NMDA receptor subunits and can be arranged in different ways to form a tetramer, a four subunit receptor.

The Association is governed by a board made up of representatives from each of the four classes.

So a quick count could be made at any time, even by an illiterate clerk, of the number of registered persons in four age-and-sex classes.

Numbers of registered persons in four age-and-sex classes were counted each year.

What we have left as reasonably comparable are four classes: ( 1 ) body parts and products, which with a proportionally nearly even representation ( 51 terms out of 253, 25 out of 100 ) come out with nearly even ratios ; ;

The superclass Tetrapoda is divided into four classes of vertebrate animals with four limbs.

But there is more to it than this ; there are four classes that are included in this belief.

Above these four classes is God " Waheguru " and the soul can choose to stay with him it wishes, or take another step and go to its people and serve them.

Below these four classes are non-humans such as plants and viruses.

The Manu Smriti ( 10. 63 ), Chanakya ’ s Arthashastra ( 1. 3. 13 ) and the Vasishtha Dharmasutra ( 4. 4 ) point out that ahimsa is a duty for all the four classes ( Varnas ) of society.

The four main classes of molecules in biochemistry are carbohydrates, lipids, proteins, and nucleic acids.

A typical class is worth 9 academic units and given the extensive core curriculum requirements in addition to individual options ' degree requirements, students need to take an average of 40. 5 units per term ( more than four classes ) in order to graduate in four years.

But they are generally divided into four classes:

In his work, Meinhof looked at noun classes with all Bantu languages having at least 10 classes and with 22 classes of nouns existing throughout the Bantu languages, though his definition of noun class differs slightly from the accepted one, considering the plural form of a word as belonging to a different class from the singular form ( thus leading, for example, to consider a language like French as having four classes instead of two ).

Chinese society has traditionally been divided into four social classes: scholar-officials, farmers, artisans, and merchants.

Below them the population was divided into four classes in a system known as mibunsei ( 身分制 ).

The British ' V ' & ' W ' classes of the late war had sought to address this by mounting six torpedo tubes in two triple mounts, instead of the four or two on earlier models.

Extracellular endosymbionts are also represented in all four extant classes of Echinodermata ( Crinoidea, Ophiuroidea, Echinoidea, and Holothuroidea ).

It is now denoted by He showed that this ring has the four units ± 1 and ± i, that the non-zero, non-unit numbers fall into two classes, primes and composites, and that ( except for order ), the composites have unique factorization as a product of primes.

Using a modified Quake engine, it featured single-player and multiplayer game modes, as well as four character classes to choose from, each with different abilities.

Instead of three classes, Hexen II features four: Paladin, Crusader, Assassin, and Necromancer, each with their own unique weapons and play style.

So with four complete Push-Pull Super-Sets No. 1, four of No. 2, four of No. 3 and four to six sets of the Incline Bench Press, you can see that Henri De Courcy has had a terrific mass-building, muscle-shaping, torso-defining workout that cannot be improved upon.

The female from Central America which gave birth to four was only 3 feet 11 inches long.

For an experiment to qualify as a binomial experiment, it must have four properties: ( 1 ) there must be a fixed number of trials, ( 2 ) each trial must result in a `` success '' or a `` failure '' ( a binomial trial ), ( 3 ) all trials must have identical probabilities of success, ( 4 ) the trials must be independent of each other.

In the left part there were four beads, which in the first row have unitary values ( 1, 2, 3, and 4 ), and in the right side there are three beads with values of 5, 10, and 15 respectively.

There were four kinds of allegiances ( Rittson v Stordy ( 1855 ) 3 Sm & G 230 ; De Geer v Stone ( 1882 ) 22 Ch D 243 ; Isaacson v Durant ( 1886 ) 54 LT 684 ; Gibson, Gavin v Gibson 3 KB 379 ; Joyce v DPP AC 347 ; Collingwood v Pace ( 1661 ) O Bridg 410 ; Lane v Bennett ( 1836 ) 1 M & W 70 ; Lyons Corp v East India Co ( 1836 ) 1 Moo PCC 175 ; Birtwhistle v Vardill ( 1840 ) 7 Cl & Fin 895 ; R v Lopez, R v Sattler ( 1858 ) Dears & B 525 ; Ex p Brown ( 1864 ) 5 B & S 280 );

In a 2011 review of the literature, fear and anxiety were said to be differentiated in four domains: ( 1 ) duration of emotional experience, ( 2 ) temporal focus, ( 3 ) specificity of the threat, and ( 4 ) motivated direction.

Since 1995 the UK government has advised that regular consumption of 3 – 4 units a day for men, or 2 – 3 units a day for women, would not pose significant health risks, but that consistently drinking four or more units a day ( men ), or three or more units a day ( women ), is not advisable.

Another similarity is that many apicomplexan cells contain a single plastid, called the apicoplast, surrounded by either 3 or four membranes.

On June 3, 2009, it was reported that Aon had signed a four year shirt sponsorship deal with English football giant Manchester United.

Two airports, Sofia Airport and Burgas Airport, had a runway longer than 3, 000 meters, and there were four heliports.

" Number of times batted, except that no time at bat shall be charged when a player: ( 1 ) hits a sacrifice bunt or sacrifice fly ; ( 2 ) is awarded first base on four called balls ; ( 3 ) is hit by a pitched ball ; or ( 4 ) is awarded first base because of interference or obstruction ..."

The Lions won all of their games that did not have test status except for the matches against Auckland, Wellington and Canterbury ; they did however lose three of their four test matches against the All Blacks, winning the first test 6 – 3 ..

* Tennis racquets are about four times as heavy as badminton racquets, 10 – 12 ounces ( approximately 284 – 340 grams ) versus 2 – 3 ounces ( 70 – 105 grams ).

There are four gearing options: two-speed hub gear integrated with chain ring, up to 3 chain rings, up to 11 sprockets, hub gear built in to rear wheel ( 3-speed to 14-speed ).

Caesar himself mentions few place-names ; and although the battle is called after Pharsalos, four ancient writers – the author of the Bellum Alexandrinum ( 48. 1 ), Frontinus ( Strategemata 2. 3. 22 ), Eutropius ( 20 ), and Orosius ( 6. 15. 27 ) – place it specifically at Palaepharsalos.

The vision in the first year of Belshazzar the king of Babylon ( 7: 1 ) concerning four great beasts ( 7: 3 ) representing four future kings ( 7: 17 ) or kingdoms ( 7: 23 ), the fourth of which devours the whole earth, treading it down and crushing it ( 7: 23 ).

E has two clauses ( denoted by parentheses ), four variables ( x < sub > 1 </ sub >, x < sub > 2 </ sub >, x < sub > 3 </ sub >, x < sub > 4 </ sub >), and k = 3 ( three literals per clause ).