CD14 is a glycosylphosphatidylinositol-linked glycoprotein that is preferentially expressed by mature cells of monocytic lineage (monocytes, macrophages, Langerhans cells) and follicular dendritic cells. Neutrophils exhibit lower levels of expression.lineage (monocytes, macrophages, Langerhans cells) and follicular dendritic cells. Neutrophils exhibit lower levels of expression.