Name:	thymus
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:	T cell
Synonyms:	immature T cell, immature T lymphocyte, immature T-cell, immature T-lymphocyte, mature T cell, mature T lymphocyte, mature T-cell, mature T-lymphocyte, T lymphocyte, T-cell, T-lymphocyte
Definition:	A type of lymphocyte whose defining characteristic is the expression of a T cell receptor complex.
Ontology:	Anatomy Ontology [ZFA:0009046]

Symbol:

Name:

recombination activating 1

Previous Names:

etID309719.25 (1), recombinase

Location:

Chr: 25 Mapping Details/Browsers

Name:	decreased amount
Synonyms:	decreased, decreased number, present in fewer numbers in organism, reduced, subnumerary
Definition:	An amount which is relatively low.
Ontology:	Phenotypic Quality Ontology [PATO:0001997]