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==Morphology== Kinetoplastids are [[eukaryotic]] and possess normal eukaryotic organelles, for example the [[Cell nucleus|nucleus]], mitochondrion, [[golgi apparatus]] and flagellum. Along with these universal structures, kinetoplastids have several distinguishing morphological features such as the kinetoplast, sub-pellicular microtubule array and paraflagellar rod.{{cn|date=March 2023}} ===Mitochondrion and kinetoplast DNA=== {{Main|Kinetoplast}} The kinetoplast, after which the class is named, is a dense DNA-containing granule within the cell's single mitochondrion, containing many copies of the mitochondrial [[genome]]. The structure is made up of a network of concatenated circular DNA molecules and their related structural proteins along with [[DNA polymerase|DNA]] and [[RNA polymerase]]s. The kinetoplast is found at the base of a cell's flagella and is associated to the flagellum [[basal body]] by a [[Cytoskeleton|cytoskeletal]] structure.{{cn|date=March 2023}} ===Cytoskeleton=== The cytoskeleton of kinetoplastids is primarily made up of [[microtubules]]. These make a highly regular array, the sub-pellicular array, which runs parallel just under the cell surface along the long axis of the cell. Other microtubules with more specialised roles, such as the [[rootlet microtubules]], are also present. Kinetoplastids are capable of forming [[actin]] [[microfilaments]] but their role in the cytoskeleton is not clear. Other cytoskeletal structures include the specialised attachment between the flagellum and the kinetoplast.{{cn|date=March 2023}} ===Flagella=== All kinetoplastids possess at least one flagellum; species in the order trypanosomatida have one and [[bodonida]] have two. In kinetoplastids with two flagella most forms have a leading and trailing flagellum, the latter of which may be attached to the side of the cell. The flagella are used for locomotion and attachment to surfaces. The bases of the flagella are found in a specialised pocket structure which is also the location of the [[cytostome]].{{cn|date=March 2023}} [[File:2023 Kinetoplastid.svg|thumb|center|upright=2|{{center|'''Representation of a kinetoplastid'''}}{{ordered list|[[Flagellum]]| Flagellar membrane| Flagellar axoneme| Paraflagellar rod| Flagellar attachment zone| Flagellar-associated [[Endoplasmic reticulum|ER]]| Pelicular microtubules| [[Endosome]], sorts material| Glycosome| [[Acidocalcisome]]| [[Mitochondria|Mitochondrion]], creates [[Adenosine triphosphate|ATP]] (energy) for the cell (discoid cristae)| [[Cell nucleus|Nucleus]]| [[Golgi apparatus]], modifies [[protein]]s and sends them out of the cell| Flagellar pocket collar| Flagellar pocket| [[Basal body|Basal bodies]]| Connecting fibres| [[Kinetoplast]], DNA-containing granule| Antipodal site}}]]
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