The Arabidopsis apyrase AtAPY1 is localized in the Golgi instead of the extracellular space.

Schiller M, Massalski C, Kurth T, Steinebrunner I

The two highly similar Arabidopsis apyrases AtAPY1 and AtAPY2 were previously shown to be involved in plant growth and development, evidently by regulating extracellular ATP signals. The subcellular localization of AtAPY1 was investigated to corroborate an extracellular function.