The phox homology (PX) domain is a 125 residue module that was originally named for its presence in the p40 phox and p47 phox subunits of the NADPH oxidase 1. Mutations in p47 phox, including its PX ...
The vacuole is necessary for plant viability — the recent isolation and characterization of Arabidopsis thaliana vacuoless 1, a mutant impaired in vacuole formation and function, is embryonic lethal.