The IEDB SoT is designed to be used by both humans and software. For humans, we provide HTML pages connected by hyperlinks. For machines, we provide a consistent API to access data in several machine-readable formats.

ONTIE and Other Resources

SoT provides access to the ONTIE application ontology and a number of other resources used by ONTIE and IEDB, including the NCBI Taxonomy, Chemical Entities of Biological Interest, the MHC Restriction Ontology, and more. The full list of resources (including ONTIE) is available at https://ontology.iedb.org/resources. You can query for a specific resource or across all resources.

Individual ONTIE Terms

Individual ONTIE terms can be accessed at their term IRI, for example https://ontology.iedb.org/ontology/ONTIE_0000001. An HTTP GET request to the term IRI will return an HTML document with embedded RDFa data. Alternative representations are available in Turtle, JSON-LD, and TSV formats.


The JSON Linked Data representation of a single term is a standard JSON object with a few special conventions:

In order to capture RDF semantics, IRIs and literal values are represented as objects, using arrays when multiple values are given. For example, https://ontology.iedb.org/ontology/ONTIE_0000001.json?select=label,alternative%20term,subclass%20of includes the following plus JSON-LD context:

{"@id": "https://ontology.iedb.org/ontology/ONTIE_0000001",
 "@type": "owl:Class",
 "obo:IAO_0000118": "balb",
 "rdfs:label": "Mus musculus BALB/c",
 "rdfs:subClassOf": {
    "@id": "obo:NCBITaxon_10090"

Tab-Separated Values

A table of tab-separated values about a term can also be requested. By default, the properties included are IRI, label, obsolete, and replacement. For example https://ontology.iedb.org/ontology/ONTIE_0000001.tsv:

IRI label   obsolete    replacement recognized
https://ontology.iedb.org/ontology/ONTIE_0000001    Mus musculus BALB/c         true

If the query parameter show-headers is false, then the header row is omitted, for example https://ontology.iedb.org/ontology/ONTIE_0000001.tsv?show-headers=false:

https://ontology.iedb.org/ontology/ONTIE_0000001    Mus musculus BALB/c         true

The select query parameter controls the columns that are returned. Provide a comma-separated list of predicate labels, or one of the special values: IRI, CURIE, recognized. The order of predicates is respected in the returned data. For example, https://ontology.iedb.org/ontology/ONTIE_0000008.tsv?select=CURIE,label,alternative%20term:

CURIE   label   alternative term
ONTIE:0000008   Mus musculus 6.5 TCR Tg Tg(Tcra/Tcrb)1Vbo|SFERFEIFPKE-specific TCR Tg|14.3.d

Multiple values, such as multiple alternative term values, are separated by a single pipe character (|).

When compact=true is set, values will be returned as CURIEs instead of IRIs, for example https://ontology.iedb.org/ontology/ONTIE_0002059.tsv?select=CURIE,replacement&compact=true:

CURIE   replacement
ONTIE:0002059   ONTIE:0002053

If the name of a predicate in a select is followed by [IRI], [CURIE], or [label], then the system will attempt to return values for the column in the format. For example: https://ontology.iedb.org/ontology/ONTIE_0002059.tsv?select=CURIE,replacement%20[CURIE],replacement%20[label]:

CURIE   replacement [CURIE] replacement [label]
ONTIE:0002059   ONTIE:0002053   Large structural phosphoprotein (Human betaherpesvirus 5)

Individual Subjects

You can query for individual subjects within a resource or across all resources using the subject CURIE or IRI. Special characters in IRIs should be escaped:

Subject pages are also available in other formats:


You can get the list of all predicates used within a resource or across all resources:

Multiple Subjects

You can also query for multiple subjects within a resource or across resources:

The HTML form lets you build a query and return results in HTML or TSV formats. The query is controlled by the query parameters in the URL.

You can specify a constraint on the query as the combination of a predicate, an operator, and an object. The predicate should be a label such as type or alternative term. The operator should be one of:

The object is the value to match. For example, to match any rdfs:label starting with 'Mus' the query parameter would be label=like.Mus*: https://ontology.iedb.org/resources/ONTIE/subjects?label=like.Mus*

The IRI and CURIE query parameters are used to specify exactly which subjects to search for. A row is returned for each requested subject, in order, whether or not the requested subject is found in the resource. This is useful for checking term status. Use the in.(*) operator, like so: https://ontology.iedb.org/resources/ONTIE/subjects?CURIE=in.(ONTIE:0000001,ONTIE:0000002). Also see "POST instead of GET" below.

POST instead of GET

When requesting a large number of terms, you can use HTTP POST instead of HTTP GET, and provide a list of the requested CURIEs or IRIs in the body of the request. For example, POSTing to https://ontology.iedb.org/resources/all/subjects?method=GET&format=tsv with this body:


will return a table:

CURIE   label   obsolete    replacement recognized
ONTIE:0000001   Mus musculus BALB/c         true
NCBITaxon:10090 Mus musculus            true
NCBITaxon:0             false

The body of the POST request is a list of CURIEs or IRIs. The first row should be CURIE or IRI. The HTTP Content-Type should be text/plain or text/tab-separated-values, not application/x-www-form-urlencoded which is the default for some tools.

The response will be a table of tab-separated values with four columns and a row for each submitted CURIE/IRI. If a term does not exist, no row will be returned for that term. The columns are:

  1. IRI or CURIE (corresponding to the request)
  2. label
  3. obsolete: true if the term is obsolete, blank or false if the term is not obsolete
  4. replacement: if the term is recognized and obsolete and has been replaced by another term, this column will contain the replacement term IRI; otherwise it will be blank
  5. recognized: true if the the term exists in the resource, false if it does not

You can use the following query parameters in a POST request: * show-headers * select (for predicates)

For example, POSTing to https://ontology.iedb.org/resources/all/subjects?method=GET&format=tsv&select=CURIE,label&show-headers=false with this body:


will return a table:

ONTIE:0000001   Mus musculus BALB/c
ONTIE:0000002   Mus musculus BALB/c A2/Kb Tg