Why mature offsets are reified (mb:Placement)

Mature miRNA	Stem-loop	From	+1
oan-miR-153-1-5p	oan-mir-153-1	57	…
oan-miR-153-2-5p	oan-mir-153-2	1	…
oan-miR-153-3p	oan-mir-153-1	96	…
oan-miR-153-3p	oan-mir-153-2	39	…

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The query

PREFIX mb: <https://w3id.org/rete/mirbase#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> SELECT ?mature ?stemLoop ?from ?to WHERE { ?pl a mb:Placement ; mb:mature ?m ; mb:stemLoop ?h ; mb:matureFrom ?from ; mb:matureTo ?to . ?m rdfs:label ?mature . ?h rdfs:label ?stemLoop . FILTER(STRSTARTS(?mature, "oan-miR-153")) } ORDER BY ?mature ?stemLoop

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