SLAMF1 and infection: The hemagglutinin gene consisting of 1824 nucleotides encodes for H protein, which is directly involved in infection and in viral tropism as it binds to the signaling lymphocyte activation molecule (SLAM, also known as CD150), a membrane glycoprotein expressed on lymphocytes and dendritic cells [3], as well as the nectin-4 receptor on epithelial cells [4].