EPS15L1 (epidermal growth factor receptor substrate 15-like 1), also known as EPS15R (EPS15-related), is structurally related to the EPS15 protein, a protein involved in the receptor-mediated endocytosis of the EGF receptor. EPS15L1 and EPS15 both contain an EH (Eps15 homology) domain, a protein-protein interaction domain found in several proteins that participate in endocytosis, vesicle transport, and signal transduction.