complement activation, lectin pathway GO:0001867 complement cascade, lectin pathway Note that proteins such as mannose-binding lectin (MBL) and certain serum ficolins can activate the lectin complement pathway. Any process involved in the activation of any of the steps of the lectin pathway of the complement cascade which allows for the direct killing of microbes and the regulation of other immune processes. Reactome:R-HSA-166662 biological_process complement activation innate immune response