[group] Nuclear proteostasis|Chaperone|Histone chaperone
status=mapped scope=ok_for_propagation_to_go GO=[GO:0140713 histone chaperone activity]
rationale: This PN group collects nuclear histone-chaperone factors involved in histone handling, deposition, or exchange. The PN bucket is narrower than general nuclear proteostasis and aligns well with the GO molecular function histone chaperone activity.
[class] Nuclear proteostasis|Chaperone
status=no_mapping scope= GO=[]
rationale: Reviewed as the nuclear chaperone class. The current member set includes histone chaperone and nuclear proteostasis context, but the class is not a single GO-equivalent activity; the histone-chaperone child mapping carries the defensible propagation.
[branch] Nuclear proteostasis
status=no_mapping scope= GO=[]
rationale: Reviewed as a top-level PN branch. This is a systems/taxonomy umbrella, not a direct GO assertion; narrower child curations carry any propagating GO mappings.