_:vb50934975 . . _:vb50934975 ":arcc045b418" . . . "reagent role"@en . "SIO_000893" . "A role of a chemical substance that participates in a chemical reaction as part of some scientific investigation."@en . _:vb50934975 . _:vb50934975 . . _:vb50934975 . _:vb50934975 .