Name: | yolk |
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Synonyms: | yolk cell |
Definition: | Giant syncytial uncleaved cell containing nutrient store for embryonic development in the form of semicrystalline phospholipoprotein and contained within yolk granules. |
Ontology: | Anatomy Ontology [ZFA:0000084] |
Name: | microtubule |
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Synonyms: | microtubuli, microtubulus, neurotubule |
Definition: | Any of the long, generally straight, hollow tubes of internal diameter 12-15 nm and external diameter 24 nm found in a wide variety of eukaryotic cells; each consists (usually) of 13 protofilaments of polymeric tubulin, staggered in such a manner that the tubulin monomers are arranged in a helical pattern on the microtubular surface, and with the alpha/beta axes of the tubulin subunits parallel to the long axis of the tubule; exist in equilibrium with pool of tubulin monomers and can be rapidly assembled or disassembled in response to physiological stimuli; concerned with force generation, e.g. in the spindle. |
Ontology: | GO: Cellular Component [GO:0005874] QuickGO AmiGO |
Name: | structure |
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Synonyms: | conformation, relational structural quality |
Definition: | A morphology quality inhering in a bearer by virtue of the bearer's relative position, shape, arrangements and connectivity of an organism's various parts; the pattern underlying its form. |
Ontology: | Phenotypic Quality Ontology [PATO:0000141] |