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Querying the Pathway Commons API returns empty string

Hi, I'm trying to get the Pathway Common API to return all interactions between a set of genes. I came across some situations where the API returns an empty string, but the website shows an interactions. Specifically, calling for all paths of length 1 between ID2 and TCF4:

https://www.pathwaycommons.org/pc2/graph?source=ID2&source=TCF4&organism=9606&kind=PATHSBETWEEN&format=SIF

returns an empty string, even though these two genes are interacting in the database, as seen here:

https://apps.pathwaycommons.org/interactions?source=TCF4%2CID2

This is only the case for some pairs. JUN and FOS for example work fine:

https://www.pathwaycommons.org/pc2/graph?source=FOS&source=JUN&organism=9606&kind=PATHSBETWEEN&format=SIF

Does anyone know what is going on? Is the API querying an old version of the database? Are my queries incorrect?

interactions api pathway database commons

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