Organism names are matched through NCBI Taxonomy: “f graminearum” → Fusarium graminearum. Claims whose organism was placed there count as matches whatever the abstract calls it (maize, corn, Zea mays).
A claim can belong to several research areas, so group counts add up to more than the total.
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.