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 military bridging vehicles have existed through the years.

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 clinical and experimental data have implicated the failure of blood – brain barrier ( BBB ) function in triggering chronic or acute seizures, some studies implicate the interactions between a common blood protein — albumin and astrocytes.

Several clinical and experimental data have implicated the failure of blood – brain barrier function in triggering chronic or acute seizures.

Several years later, discouraged by disputes with partners and the failure of the lead mine on the property, Audubon sold Mill Grove and moved to Kentucky to seek his fortune as a frontier merchant.

Several newspapers have reported that copied number plates are being used to avoid the congestion charge, resulting in vehicle owners receiving penalty notices for failure to pay when their vehicles have not been inside the zone.

Several ruinous civil wars in the late 1600s had squandered the country's human and other resources ; the 1690s also saw several years of wide-scale crop failure, which brought famine.

Several members of the section Phalloidieae are notable for their toxicity, containing toxins known as amatoxins, which can cause liver failure and death.

Several pieces of debris separated from the space station at around the time of its failure, including both solar panels, which removed its ability to generate power.

Several venues use their own ticketing systems ; this is partly due to issues of commissions and how ticket revenue is distributed, and was reinforced by the 2008 failure of the main box office.

Several inhibitors of NEP are currently being developed to treat disorders ranging from hypertension to heart failure.

Several explanations of equipartition's failure to account for molar heat capacities were proposed.

Several of the issues mentioned below have been raised against the Western Church for centuries, as can be seen in The Byzantine Lists: Errors of the Latins, by Tia M. Kolbaba ( University of Illinois Press, 2000 ), which treats of the Latins ' prohibition of ordination of married men, the addition of Filioque to the creed, Lenten fasting different from that in the East, fasting on Saturday, azymes in the Eucharist, differences on baptism, marriage within forbidden degrees, failure to revere icons sufficiently, bishops wearing rings, insufficient reverence for the Virgin Mary, making the sign of the cross differently, various liturgical differences and many similar " errors ".

Several Saudi accounts were discovered to have financial improprieties, including a lack of required background checks and a consistent failure to alert regulators to large transactions, in violation of federal banking laws.

Several issues arise from the fusion ; under law and business ethics, the director of a firm is obligated to act in best interest of the company he or she is involved in, and failure to oblige under some circumstances can be a federal crime.

Several failure rate data sources are available commercially that focus on commercial components, including some non-electronic components.

Several factors, including distance, weather, crowd noise, and a kicker's leg strength and experience determine the success or failure of a field goal attempt.

Several of the FARC's critics believe that, despite the unjustifiable bloodshed, it is debatable whether such positions are entirely a consequence of the UP's failure.

Several changes were made from Lindsay's novel including shifting the location from New South Wales to the Barrier Reef and making the artist a success instead of a failure.

Several turning points in Miller's career are depicted with varying degrees of verisimilitude, including: the success of an early jazz band arrangement ; his departure from the Broadway pit and sideman work to front a band of his own ; the failure of his first band on the road ; and the subsequent re-forming of his successful big band and the establishment of the “ Miller Sound ” as typified by “ Moonlight Serenade ”.

Several commercial airline disasters have been traced to a failure of the pitot-static system.

Several proposals were floated for lift bridges of various sorts, including a scheme to raise the existing bridge on mechanical jacks, but the War Department did not approve, insisting on a failure proof means of clearance.

Several French captains were court-martialed: Jean Magnac of Zélé, already blamed for the failure at Cornwallis's Retreat, was dismissed from the Navy, as was Captain Giot-Labrière of Fougueux.

Several renal failure patients developed myoclonus while receiving pregabalin, apparently as a result of gradual accumulation of the drug.

Several insights into renal function and acute renal failure were made during the war, not least of which would be Bywaters and Beall's descriptions of pigment-induced nephropathy drawn from their clinical experiences during the London Blitz.