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LAMP3 also known as DC-LAMP (Dendritic cell lysosomal associated membrane glycoprotein) is a member of the LAMP family along with LAMP1 and LAMP2, these proteins make up the members of the glycoconjugate coat present on the inside of the lysosomal membrane. In humans, this protein is almost exclusively found in mature Dendritic cells. While LAMP3 can be observed on the surface of dendritic cells, the protein is mainly found within lysosomes. In cells, LAMP3 aids in the identifying and processing of an antigen during an immune response. LAMP3 protein is linked with the maturation of dendritic cells, as a marker for transformed type II pneumocytes or alveolar cells. Studies have linked LAMP3 with the viral replication of Influenza A cells.