Organism names are matched through NCBI Taxonomy: “fusarium” → Fusarium. Claims whose organism was placed there count as matches whatever the abstract calls it (maize, corn, Zea mays).
Taxon groups are the verbatim names found in the abstracts (case-insensitive), not normalised: maize, corn and Zea mays are separate groups here. The Organism view merges them through NCBI Taxonomy.
Lexical search (BM25). All words must match; if nothing does, any word. Organism names also match every spelling of the same organism. No semantic search yet.