subfamily

Pregnane X receptor ( PXR) belongs to NR1 Ⅰ subfamily of the nuclear receptor superfamily(NR).

X体（PXR）属于核体超家族（NR）NR1Ⅰ家族。

ADP-ribosylation factors (ARFs), a subfamily of the small GTP binding proteins superfamily, are believed to participate in vesicular transport and signal transduction events in the cell.

棉花纤维发育需要有高尔基体参与，但ARF基因在棉花纤维发育中功能尚不清楚。