Phenotype: | thymus lacks all parts of type lymphoid progenitor cell, abnormal |
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Note: | This statement combines anatomy and/or ontology terms with phenotype quality terms to create a complete phenotype (EQ) statement. For detailed information on individual terms, click the hyperlinked term name. |
Name: | thymus |
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Synonyms: | |
Definition: | Paired organ where maturation of T-lymphocytes occurs. The adult thymus located on the dorsomedial aspect of the branchial cavity above the third pharyngeal cartilage. The thymus undergoes a period of rapid growth beginning at about the third week and continuing for several more weeks. Accompanying this growth is a dramatic change in the shape of the thymus. It is ovoid initially and then starts to grow dorsally along the skull, forming a characteristic protrusion. During this growth period the adult pattern of rag1-positive cortex and rag1-negative medulla becomes established. The protrusions diminish with age and the thymus gradually shrinks; at two years, the thymus is again confined to the pharynx with minimal if any protrusion. |
Ontology: | Anatomy Ontology [ZFA:0001078] |
Name: | lacks all parts of type |
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Synonyms: | lacks all physical parts of type |
Definition: | A quality of physical entities inhering in a bearer by virtue of the bearer's lacking a physical part as specified by the additional entity. |
Ontology: | Phenotypic Quality Ontology [PATO:0002000] |
Name: | lymphoid progenitor cell |
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Synonyms: | lymphoid progenitor cells |
Definition: | A progenitor cell restricted to the lymphoid lineage. |
Ontology: | Anatomy Ontology [ZFA:0009355] |