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Index
A species, as NCBI Taxonomy names it. It is in the graph because a curated compound is prepared from it, and the compounds are linked below.
18 organisms in the graph. None is connected directly to a compound that carries a graded finding, so none is indexed — they serve, and they link onward. That is a fact about how much has been curated and about the shape of the connection, not about the organisms: a organism reaches a curated compound through a protein, which is two steps, and the indexation floor asks for one.
2 of 18 begin with B
Bacopa. Species-rank node; bacoside standardisation recorded on the edge.
Beetroot. Dietary nitrate is the presumed active and is a separate compound node; a beetroot-juice trial is an edge here.