mitosome

A double-membrane-bounded organelle that functions in iron-sulfur protein maturation; evolutionarily derived from mitochondria. The mitosome has been detected only in anaerobic or microaerophilic organisms that do not have mitochondria, such as Entamoeba histolytica, Giardia intestinalis and several species of Microsporidia. These organisms are not capable of gaining energy from oxidative phosphorylation, which is normally performed by mitochondria.


bilobe structure

biolink:CellularComponent biolink:AnatomicalEntity biolink:OrganismalEntity biolink:BiologicalEntity biolink:NamedThing biolink:Entity biolink:PhysicalEssence biolink:SubjectOfInvestigation biolink:ThingWithTaxon biolink:PhysicalEssenceOrOccurrent

A cytoskeletal structure in some kinetoplastid species linking the structures of the ciliary pocket collar and the flagellum attachment zone (aka cilium attachment zone).


actin filament branch point

The part of an actin filament where the structure forks.


hydrogenosome

A spherical, membrane-bounded organelle found in some anaerobic protozoa, which participates in ATP and molecular hydrogen formation.


symbiont-containing vacuolar space

The space between a symbiont plasma membrane and the symbiont-containing vacuole membrane.


endonuclear canal

A membrane-bound structure present in the nucleus of a spermatozoon. There is variation in the number of endonuclear canals between sperm of different organisms, and some species lack these structures altogether. The endonuclear canal may provide a supporting role for the sperm nucleus, and originates during spermiogenesis from an invagination of the nuclear envelope.


presynaptic active zone dense projection

Electron dense projection extending from the cytomatrix into the cytoplasm on which synaptic vesicles are tethered.


etioplast prolamellar body

A three dimensional regular lattice found in etioplasts. It is composed of a continuous system of tubules but when exposed to light the symmetrical arrangement is rapidly lost as tubules become pinched off into two dimensional sections of lattice. These for perforated sheets of membrane that move apart, extend and increase, finally establishing the typical granal and intergranal lamellae of the mature chloroplast.


Hechtian strand

An extended membranous thread which firmly connects the plasma membrane to the cell wall during plasmolysis such that the plasma membrane does not separate from the cell wall completely.


platelet dense tubular network lumen

The volume enclosed by the membranes of the platelet dense tubular network.


cytostome

Stable, specialized structure for the ingestion of food by the cell into phagosomes.


endosperm protein body

A membrane-bounded plant organelle found in the developing endosperm, contains storage proteins.


bacterial-type flagellum basal body, distal rod, P ring

One of the rings of the bacterial-type flagellar basal body; anchors the basal body to the peptidoglycan layer.


extrinsic component of external side of cell outer membrane

The component of a cell outer membrane consisting of gene products and protein complexes that are loosely bound to its external surface, but not integrated into the hydrophobic region.


bacterial biofilm matrix surface

The external part of the biofilm matrix, a structure lying external to bacterial cells. A biofilm is an aggregate of surface-associated bacteria, and the biofilm matrix is the envelope of polymeric substances that surrounds the bacteria.


extrachromosomal circular DNA

Circular DNA structures that are not part of a chromosome.


adventitious septum

A cell septum whose formation is independent of nuclear division.


neural crest-derived structure

biolink:AnatomicalEntity biolink:OrganismalEntity biolink:BiologicalEntity biolink:NamedThing biolink:Entity biolink:PhysicalEssence biolink:SubjectOfInvestigation biolink:ThingWithTaxon biolink:PhysicalEssenceOrOccurrent

An anatomical structure that develops from the neural crest.


ectoderm-derived structure

An anatomical structure that develops (entirely or partially) from the ectoderm.


structure with developmental contribution from neural crest

An anatomical structure that has some part that develops from the neural crest.


mesoderm-derived structure

An anatomical structure that develops (entirely or partially) from the mesoderm.


endoderm-derived structure

An anatomical structure that develops (entirely or partially) from the endoderm.


chemical entity

A chemical entity is a physical entity of interest in chemistry including molecular entities, parts thereof, and chemical substances.


main group molecular entity

A molecular entity containing one or more atoms from any of groups 1, 2, 13, 14, 15, 16, 17, and 18 of the periodic table.


virus tail, baseplate

Multiprotein component at the distal (head) end of the virus tail to which fibers of tailed viruses may be attached.


polyatomic entity

Any molecular entity consisting of more than one atom.


viral inner capsid

The inner layer of a double or triple concentric icosahedral capsid. Inner capsids are part of reoviridae and cystoviridae virions.


viral nucleocapsid

The complete protein-nucleic acid complex that is the packaged form of the genome in a virus particle.


virus tail, tip

The basal end of the virus tail, which is used by the virus to attach to the host cell.


virus tail

Part of the virion that may be used to recognize, attach and inject the viral genome and accessory proteins into the host cell.


virus tail, tube

The internal tube of the contractile tails of some viruses. The virus tail tube is the channel for DNA ejection into the host cytoplasm.


icosahedral viral capsid, collar

A small disk located at the base of some icosahedral virus capsids.


virus tail, fiber

The fibrous region of the virus tail used to scan, recognize and attach to the host cell.


virion nucleoid

The region of a virion in which the nucleic acid is confined.


virion membrane

The lipid bilayer surrounding a virion.


icosahedral viral capsid, spike

A short structure attached to an icosahedral virion capsid, and used for attachment to the host cell.


viral procapsid

A stable empty viral capsid produced during the assembly of viruses.


icosahedral viral capsid, neck

A region of constriction located below the head and above the tail sheath of viruses with contractile tails (Myoviridae).


virus tail, shaft

The tube of the non-contractile tails of some viruses.


viral outer capsid

The outer layer of a double or triple concentric icosahedral capsid. Outer capsids are part of reoviridae and cystoviridae virions.


molecular entity

Any constitutionally or isotopically distinct atom, molecule, ion, ion pair, radical, radical ion, complex, conformer etc., identifiable as a separately distinguishable entity.


virion component

Any constituent part of a virion, a complete fully infectious extracellular virus particle.