Different gene data sources map to a different number of uniprot IDs

[danidi]

Comparing corresponding gene URIs (ncbigene and ensembl), a different number of uniprot URIs is retrieved (one for ncbigene, three for ensembl). As the ncbi identifier maps to the ensembl identifier, I was expecting the same results. It seems as if the transitive is not used in this case?

http://ops2.few.vu.nl/QueryExpander/mapUri?Uri=http%3A%2F%2Fidentifiers.org%2Fncbigene%2F9462&lensUri=http%3A%2F%2Fopenphacts.org%2Fspecs%2F%2FLens%2FDefault&Pattern+Filter=&overridePredicateURI=&format=text%2Fhtml

http://ops2.few.vu.nl/QueryExpander/mapUri?Uri=http%3A%2F%2Fensemblgenomes.org%2Fid%2FENSG00000075391&lensUri=http%3A%2F%2Fopenphacts.org%2Fspecs%2F%2FLens%2FDefault&Pattern+Filter=&overridePredicateURI=&format=text%2Fhtml