Several competing models, although correctly dealing with the conformation of each individual peptide chain, gave way to the triple-helical " Madras " model, which provided an essentially correct model of the molecule's quaternary structure although this model still required some refinement .< ref > The packing structure of collagen has not been defined to the same degree outside of the fibrillar collagen types, although it has been long known to be hexagonal or quasi-hexagonal.

Several types of chocolate can be distinguished.

Figure 8: Several types of diodes.

Several laboratory scale techniques for distillation exist ( see also distillation types ).

Several thousand patients have been treated with various types of tumours.

Several types of brain lesions can occur in individuals with TSC and 60 %-90 % of people with TSC develop epilepsy.

Several grappling styles like Judo, Shoot wrestling, Catch wrestling, Brazilian jiu-jitsu, Sambo and several types of wrestling including Freestyle and Greco-Roman have gained global popularity.

Several types are existent in Qing dynasty and used in dishes of stewing hams ( 火腿炖肘子 ), and vegetables, or for a wide variety of soup and important soup stocks.

Several types of FDA approved vacuum therapy devices are available with a doctor's prescription.

Several types of wild greens, known collectively as chwinamul ( such as Aster scaber ), are a popular dish, and other wild vegetables such as bracken fern shoots ( gosari ) or Korean bellflower root ( doraji ) are also harvested and eaten in season.

Several different types of light sources exist, each having different properties that affect their appropriateness for certain tasks, particularly efficiency and spectral power distribution.

Several types of molecules are particularly important during morphogenesis.

Several types of cell adhesion molecules are known and one major class of these molecules are cadherins.

Several types of " mania " such as kleptomania and pyromania are related more closely to obsessive-compulsive disorder than to bipolar disorder, depending on the severity of these disorders.

Several types of plasmid addiction systems ( toxin / antitoxin, metabolism-based, ORT systems ) were described in the literature and used in biotechnical ( fermentation ) or biomedical ( vaccine therapy ) applications.

Several cell types may be present in the epidermis.

Several types of RNA can downregulate gene expression by being complementary to a part of an mRNA or a gene's DNA.

Several types of visual prosthesis are in development or trials in humans, and one device has been approved for sale in the European market.

Several types of random samples are simple random samples, systematic samples, stratified random samples, and cluster random samples.

Several types of mushroom ( het ) also feature in Thai cuisine such as straw mushrooms ( het fang ) and white jelly fungus ( het hu nu khao ).

) Several types of naval " torpedo " were developed and deployed, most often by the Confederates, who faced a severe disadvantage in more traditional warfare methods.

Several types of fish can detect ultrasound.

Several types of pumps may be used in sequence or in parallel.

Several types have technological importance, for example, in liquid crystal displays.

Several things were notable about this battle, in which Charles set the pattern for the remainder of his military career: first, he appeared where his enemies least expected him, while they were marching triumphantly home and far outnumbered him.

Several military engineering vehicles have been developed in various nations to achieve this task.

Several groups claim that the military base on Diego Garcia has been used by the US government for transport of prisoners involved in the controversial extraordinary rendition program, an allegation formally reported to the Council of Europe in June 2007.

Several American and Danish military bases are located in Greenland, including the US Thule Air Base.

Several communist countries supported the guerrillas with weapons and military training.

* 1964 – Martyrs ' Day: Several Panamanian youths try to raise the Panamanian flag on the U. S .- controlled Panama Canal Zone, leading to fighting between U. S. military and Panamanian civilians.

Several experienced commanders who fought in the British military in World War II joined Pakistan Armed Forces giving it professionalism, experience and leadership.

Several Puerto Ricans became notable commanders, five have been awarded the Medal of Honor, the highest military decoration in the United States, also several Puerto Ricans have attained the rank of General or Admiral, which requires a Presidential nomination and Senate confirmation.

Several large US military installations were located in the nearby area, with Hardy Barracks probably the most significant ( the US Embassy Housing Compound, Hardy Barracks Recreational Lodging, Stars and Stripes office and heliport are still there ).

Several sources claim that during his studies he was more interested in religion than joining the military.

Several German military orders in both world wars had grades adorned with crossed swords, e. g. Knight's Cross with Oak Leaves and Swords ( mit Eichenlaub und Schwertern ), and so was the British Order of Merit when awarded for military achievements.

Several other historians of the Zulu, and the Zulu military system however, affirm the mobility rate of up to 50 miles per day.

Several months were spent with Commandos touring the country disarming military outposts.

Several western sources reported that the Qing dynasty Imperial Chinese military under the direction of Li Hongzhang acquired " Electric torpedoes ", which were deployed in numerous waterways along with fortresses and numerous other modern military weapons acquired by China.

* January 27 – Several explosions at a military dump in Lagos, Nigeria kill more than 1, 000.

Several classified military payloads were also carried.

Several military derivatives took precedence in the Soviet design process, though they never came to pass.

Several other countries also provided military assistance to Uganda.

Several members of the Argentine military junta have been found to be P2 members, such as Raúl Alberto Lastiri, Argentina's interim president from July 13, 1973 until October 12, 1973, Emilio Massera, part of Jorge Videla's military junta from 1976 to 1978, and José López Rega, the infamous founder of the Argentine Anticommunist Alliance (" Triple A ").

Several clinical and epidemiological studies conducted in the United States and in the United Kingdom have investigated the occurrence of MCS in military personnel deployed to the Persian Gulf during the 1990s.

Several other military memorials were built in the area.