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Such nanopublications use the concept of an AIDA sentence to express a (scientific) statement in an informal or semi-formal manner, and link it to the source it is derived from.
AIDA sentences are:
In addition to the plain AIDA template, this variant records one or more sources (e.g. a paper DOI) the sentence is derived from, via prov:wasDerivedFrom in the assertion itself.
You can find more information about AIDA sentences here.