Human secreted Programmed Cell Death 1 Ligａnd 1 (PD-L1)-Fc fusion protein, encompassing amino acids 19-239, fused at the C-terminus with the Fc portion of human IgG1 followed by an Avi-tag™. HiP™ indicates a high purity protein (≥90% pure) and less than 10% aggregation as measured by gel filtration