Sialomucin core protein 24 also known as endolyn or CD164 (cluster of differentiation 164) is a protein that in humans is encoded by the CD164 gene. CD164 functions as a cell adhesion molecule.
Sialomucins are a heterogeneous group of secreted or membrane-associated mucins that appear to play two key but opposing roles in vivo: first as cytoprotective or antiadhesive agents, and second as adhesion receptors. CD164 is a type I integral transmembrane sialomucin that functions as an adhesion receptor.
A genome wide CRISPR/Cas9 screen in human A549 cells identified CD164 as an internal entry receptor for the arenavirus Lymphocytic Choriomeningitis Virus (LCMV) .