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The olfactory epithelium is the layer of tissue that lines the nasal cavity and contains the receptors for smell. The three types of cells in the olfactory epithelium are the olfactory receptor cells, the supporting cells, and the basal cells. The olfactory receptor cells are the cells that have the receptors for smell and are responsible for detecting odors. The supporting cells are the cells that support the olfactory receptor cells and help to keep them healthy. The basal cells are the cells that divide and produce new olfactory receptor cells.

Main article: Cellular differentiation Staining of a Caenorhabditis elegans highlights the nuclei of its cells. a b c Grosberg, R. K.; Strathmann, R. R. (2007). "The evolution of multicellularity: A minor major transition?" (PDF). Annu Rev Ecol Evol Syst. 38: 621–654. doi: 10.1146/annurev.ecolsys.36.102403.114735. Archived from the original (PDF) on 2016-03-04 . Retrieved 2013-12-23.La Scola B, Audic S, Robert C et al (2003) A giant virus in amoebae. Science 299:2033. https://doi.org/10.1126/science.1081867 Andersen KG, Rambaut A, Lipkin WI et al (2020) The proximal origin of SARS-CoV-2. Nat. Med. 26:450–452 Secondary structure of proteins. The most common types of secondary structure are the α helix and the β sheet. In an α helix, hydrogen bonds form between CO and NH groups of peptide bonds separated by four amino acid residues. (more...) Ménétret, Jean-François; Schaletzky, Julia; Clemons, William M.; etal. (December 2007). "Ribosome binding of a single copy of the SecY complex: implications for protein translocation" (PDF). Molecular Cell. 28 (6): 1083–1092. doi: 10.1016/j.molcel.2007.10.034. PMID 18158904. Archived (PDF) from the original on 2021-01-21 . Retrieved 2020-09-01. Ribosomes: The ribosome is a large complex of RNA and protein molecules. [4] They each consist of two subunits, and act as an assembly line where RNA from the nucleus is used to synthesise proteins from amino acids. Ribosomes can be found either floating freely or bound to a membrane (the rough endoplasmatic reticulum in eukaryotes, or the cell membrane in prokaryotes). [26]

The three-dimensional structure of proteins is most frequently analyzed by X-ray crystallography, a high-resolution technique that can determine the arrangement of individual atoms within a molecule. A beam of X rays is directed at crystals of the protein to be analyzed, and the pattern of X rays that pass through the protein crystal is detected on X-ray film. As the X rays strike the crystal, they are scattered in characteristic patterns determined by the arrangement of atoms in the molecule. The structure of the molecule can therefore be deduced from the pattern of scattered X rays (the diffraction pattern). Structure of triacylglycerols. Triacylglycerols (fats) contain three fatty acids joined to glycerol. In this example, all three fatty acids are palmitate, but triacylglycerols often contain a mixture of different fatty acids. Quaternary structure of hemoglobin. Hemoglobin is composed of four poly-peptide chains, each of which is bound to a heme group. The two α chains and the two β chains are identical.In the case of Mitofusin 2, a mitochondrial protein, the research team has discovered two previously unknown variants named ERMIT2 and ERMIN2, which reside in the endoplasmic reticulum. ERMIT2, by interacting with Mitofusin 2, establishes the critical connection between mitochondria and the endoplasmic reticulum, while ERMIN2 regulates the structure of the latter. The human nose contains approximately 1 million odorant receptors, of which approximately 600 are labeled as ORs. ORS detects a wide range of odorants, including sweet, sour, bitter, and umami. An odorant interacts with an odorant receptors on the surface of an olfactory cell, which in turn causes the release of neurotransmitters such as acetylcholine and dopamine. The olfactory bulb is a small structure in the brain that is primarily responsible for the processing of odor information. The olfactory bulb contains approximately 100,000 olfactory receptor neurons, which play an important role in synaptic connections between the bulb’s neurons. These connections are required for the transmission of odor information to the central nervous system. A type of receptors known as a peripherin receptor is also important for detecting odors. Hormones like testosterone and estrogen are produced in the reproductive organs and detected using progesterone receptors found in the testes and ovaries. The ability to detect and respond to odorant stimuli is critical to the proper functioning of many organs and systems in the human body, and this function is essential for the human body’s ability to function properly. The proper functioning of the immune system and the regulation of emotions are critical to the proper detection of food flavors and odors, as well as the proper function of the olfactory system. What Is The Function Of Olfactory Stem Cells?