VPS18 and malaria: While the apparent essential core proteins in the CORVET-like tethering complex of malaria (VPS11, VPS18 and putatively VPS33) are not the same as for the D. melanogaster mini-CORVET (VPS16, VPS18, VPS33), the reduced complex size demonstrates that not all core proteins are essential for HOPS/CORVET function in all cases.