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.

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 negative effects may be attributed to the drinking of hot chocolate.

Several letters to Venz from a five-year-old boy, H. Bakker, asking for a chocolate bread topping, inspired and prompted de Vries ' development of sprinkles.

Several reformulated versions are sold in the United States as the U. S. Food and Drug Administration does not allow products that replace cocoa butter with vegetable fat to be called chocolate.

Several varieties are available, including Homestyle, blueberry, and chocolate chip.

Several materials or combinations of materials can be used to construct a satisfactory feed bunk.

Several other oxidation states are known, which range from + 2 to + 7 and can be identified by their characteristic optical absorption spectra.

Several ways of implementing this exist, and hot-wire devices can be further classified as CCA ( constant-current anemometer ), CVA ( constant-voltage anemometer ) and CTA ( constant-temperature anemometer ).

Several intact arched stone bridges from the Hellenistic era can be found in the Peloponnese in southern Greece

Several topics that might be covered here are instead covered there because much more can be said about them in a human context.

Several species of fungi can be used for bioleaching.

Several CPUs can be combined in a single processing chip.

Several uses of the copula can be categorized:

Several kinds of descriptive categorizations can be applied broadly to the elements, including consideration of their general physical and chemical properties, their states of matter under familiar conditions, their melting and boiling points, their densities, their crystal structures as solids, and their origins.

Several countries can use the same name for their own distinct currencies ( for example, dollar in Australia, Canada and the United States ).

Several in vitro studies indicated that high concentrations of chromium ( III ) in the cell can lead to DNA damage.

Several simple games can be played to select one person from a group, either as a straightforward winner, or as someone who is eliminated.

Several kinds of cytochrome exist and can be distinguished by spectroscopy, exact structure of the heme group, inhibitor sensitivity, and reduction potential.

Several other quantities can be used to describe the composition of a mixture.

Several of the treasuries can be identified, among them the Siphnian Treasury, dedicated by the city of Siphnos whose citizens gave a tithe of the yield from their gold mines until the mines came to an abrupt end when the sea flooded the workings.

Several well-known criteria can be used to establish a probable diagnosis.

Several qualitative observations can be made of diffraction in general:

Several unofficial remakes of Duck Hunt have been released which enable the player to shoot the dog. The dog makes a cameo appearance in the NES game Barker Bill's Trick Shooting ( another Zapper game ) and he can be shot.

Several generations of an aphid population can exist over the lifespan of a single leaf.

Several measurements can be done on the F responses, including minimal and maximal latencies, and F wave persistence.

Several other points can be considered which contradict the " cathedral glass flow " theory:

Several " Harold and Maude " fans have since built similar hearses from E-Types and photos of them can be found online.

Several ancient written precursors to Hamlet can be identified.