Glycoprotein 340 is member of the scavenger receptor superfamily and has been identified as a putative SP-D receptor. Gp340 has been shown to bind SP-D in a calcium dependent manner through a protein-protein interaction. Like SP-D, gp340 is mainly found in lung tissue and immunohistochemistry revealed high expression in alveolar macrophages (3). An identical protein is present in saliva (salivary agglutinin) and both forms are encoded by the gene DMBT1 (6).