Fig. 2. Intracellular distribution of PI4Ks and PtdIns(4)P effectors in mammalian cells. The intracellular localisation of PI4Ks and PtdIns(4)P effectors in mammalian cells suggests a central role for the Golgi complex in the synthesis and biological function of PtdIns(4)P. N, nucleus; GC, Golgi complex.