As can be seen in Figure , each ENM is linked to a reference with dcterms:source. A reference contains the DOI of the article, article title, journal, publication year and author information. The ERM identifier is linked through dcterms:identifier and the semantic annotations of material type through dcterms:type. The dcterms:title corresponds to a label we provided, while rdfs:label is the name of the ENM used in the article. The MIEs mentioned in the paper were linked to MIE and KE identifiers of the AOP-Wiki (see Section 2.1). While sio:SIO_000001 (which stand for "is related to") links the ENM to all KE identifiers from AOP-wiki, sio:SIO_000636 (which means "is trigger for") only results in those KE ID's that are labeled as MIE in AOP-wiki. The name used for the KE reported in the paper is linked with nci:C25492 ("effect"). The ENMs participate in (BFO_0000056) a measurement group (bao:BAO_0000040), linking to the measured endpoint (bao:BAO_0000179) and assay (bao:BAO_0000015). Starting from the measured endpoints (which are the physicochemical properties of ENMs such as primary size, hydrodynamic diameter, shape, zeta potential, etc.), their values and units can be explored with the predicates sio:has-value and sio:has-unit, respectively. For each assay, the protocol (obo:OBI_0000272) can be found with the bao:BAO_0002846 predicate. For six physicochemical properties, the data was normalized and added to the RDF using the predicate bao:BAO_0095000 (which means "is derived from").