The early endosome is a cellular compartment inside eukaryotic cells. It is receiving endocytosed material and sorting them for vesicular transport to late endosomes and lysosomes or for recycling to the plasma membrane. EEA1 (Early Endosome Antigen1) is a 170 kDa coiled-coil protein, which is required for vesicular transport of proteins through early endosomes. It binds membrane lipids through its FYVE domain.