What the ATPase heading includes automatically
For proton-translocating ATPase searches, `"Proton-Translocating ATPases"[mh]` includes narrower MeSH terms automatically; `"Proton-Translocating ATPases"[mh:noexp]` disables that expansion, according to [PubMed’s guide](https://pubmed.ncbi.nlm.nih.gov/help/). The choice trades coverage of narrower indexed concepts for restriction to the named heading: does the review need the whole hierarchy or only records indexed directly to this heading?
