Notes: Lipid OA2 is an ionizable cationic lipid that has been used in the generation of single-component lipid nanoparticles (LNPs) for the delivery of siRNA.{68613} LNPs containing lipid OA2 and siRNA targeting the gene encoding suppressor of cytokine signaling 1 (Socs1) decrease Socs1 expression by approximately 50% in isolated mouse bone marrow dendritic cells (BMDCs). Vaccination with ovalbumin-induced isolated mouse BMDCs transfected with LNPs composed of lipid OA2 and Socs1-targeting siRNA increases survival and decreases tumor volume in a B16-OVA murine melanoma model.