| GOID Link to GO |
Functional Category | Description | Protein Count link to protein list |
|---|---|---|---|
| GO:0001750 | photoreceptor outer segment | The outer segment of a vertebrate photoreceptor that contains discs of photoreceptive membranes. | 74 |
| GO:0032391 | photoreceptor connecting cilium | A nonmotile primary cilium that has a 9+0 microtubule array and forms the portion of the axoneme traversing the boundary between the photoreceptor inner and outer segments. | 67 |
| GO:0031513 | nonmotile primary cilium | A primary cilium which contains a variable array of axonemal microtubules but does not contain molecular motors. Nonmotile primary cilia are found on many different cell types and function as sensory organelles that concentrate and organize sensory signaling molecules. | 43 |
| GO:0035085 | cilium axoneme | The bundle of microtubules and associated proteins that forms the core of cilia in eukaryotic cells and is responsible for their movements. | 41 |
| GO:0031514 | motile cilium | A cilium which has a variable arrangement of axonemal microtubules, contains molecular motors, and beats with a characteristic whip-like pattern that promotes cell motility or transport of fluids and other cells across a cell surface. Motile cilia are typically found in multiple copies on epithelial cells that line the lumenal ducts of various tissues. Motile cilia may also function as sensory organelles. | 18 |
| GO:0072372 | primary cilium | A cilium found on many different cell types that is typically present in a single copy per cell. A primary cilium may have a variable array of axonemal microtubules and may or may not contain molecular motors. | 18 |
| GO:0042622 | photoreceptor outer segment membrane | The membrane surrounding the outer segment of a vertebrate photoreceptor. | 15 |
| GO:0060170 | cilium membrane | The portion of the plasma membrane surrounding a cilium. | 13 |
| GO:0044441 | cilium part | Any constituent part of a cilium, a specialized eukaryotic organelle that consists of a filiform extrusion of the cell surface. Each cilium is bounded by an extrusion of the cytoplasmic membrane, and contains a regular longitudinal array of microtubules, anchored basally in a centriole. | 10 |
| GO:0035253 | ciliary rootlet | A cytoskeleton-like structure, originating from the basal body at the proximal end of a cilium, and extending proximally toward the cell nucleus. Rootlets are typically 80-100 nm in diameter and contain cross striae distributed at regular intervals of approximately 55-70 nm. | 9 |
| GO:0097228 | sperm principal piece | The segment of the sperm flagellum where the mitochondrial sheath ends, and the outer dense fibers (ODFs) associated with outer axonemal doublets 3 and 8 are replaced by the 2 longitudinal columns of the fibrous sheath (FS) which run the length of the principal piece and are stabilized by circumferential ribs. The principal piece makes up ~2/3 of the length of the sperm flagellum and is defined by the presence of the FS and of only 7 (rather than 9) ODFs which taper and then terminate near the distal end of the principal piece. | 6 |
| GO:0031512 | motile primary cilium | A primary cilium which may contain a variable array of axonemal microtubules and also contains molecular motors. Motile primary cilia display a distinct twirling motion that directs fluid flow asymmetrically across the cellular surface to affect asymmetric body plan organization. | 5 |
| GO:0036126 | sperm flagellum | A microtubule-based flagellum that is part of a sperm, a mature male germ cell that develops from a spermatid. | 4 |
| GO:0036038 | TCTN-B9D complex | A protein complex that is located at the ciliary transition zone and consists of tectonic proteins, B9 domain-containing proteins and other proteins. Acts as a barrier that prevents diffusion of transmembrane proteins between the cilia and plasma membranes. In mouse, members of the complex include TCTN1, TCTN2, B9D1, MKS1, CC2D2A and other proteins. | 4 |
| GO:0097014 | cilium cytoplasm | All of the contents of a cilium, excluding the plasma membrane surrounding the cilium. | 4 |
| GO:0036064 | cilium basal body | A membrane-tethered derivative of the centriole, and the site of assembly and remodelling of the cilium. As well as anchoring the cilium, the basal body is thought to provide a selective gateway regulating the entry of ciliary proteins and vesicles by intraflagellar transport. | 3 |
| GO:0097225 | sperm midpiece | The highly organized segment of the sperm flagellum which begins at the connecting piece and is characterized by the presence of 9 outer dense fibers (ODFs) that lie outside each of the 9 outer axonemal microtubule doublets and by a sheath of mitochondria that encloses the ODFs and the axoneme; the midpiece terminates about one-fourth of the way down the sperm flagellum at the annulus, which marks the beginning of the principal piece. | 3 |
| GO:0097226 | sperm mitochondrial sheath | The tightly packed helical sheath of ATP-producing mitochondria restricted to the midpiece of the sperm flagellum. | 3 |
| GO:0035869 | ciliary transition zone | A region of the cilium between the basal body and proximal segment that is characterized by Y-shaped assemblages that connect axonemal microtubules to the ciliary membrane. The ciliary transition zone appears to function as a gate that controls ciliary membrane composition. | 2 |
| GO:0097227 | sperm annulus | The ring-like, filamentous structure located at the distal end of the midpiece of the sperm flagellum; the annulus is thought to form a diffusion barrier between the midpiece and the principal piece and serve as a stabilizing structure for tail rigidity. | 1 |