Zymosan, an insoluble preparation of cell wall from Saccharomyces cerevisiae, activates macrophages via TLR2. TLR2 cooperates with TLR6 and CD14 in response to zymosan. Zymosan is also recognized by Dectin-1, a phagocytic receptor expressed on macrophages and dendritic cells, which collaborates with TLR2 and TLR6 enhancing the immune responses triggered by the recognition of Zymosan by each receptor.