APOC3 and hyperlipidemia: Therefore, we crossed ApoCIIItg mice and ApoCIII−/− mice with GPIHBP1−/− mice, another extreme hypertriglyceridemia mouse model, to generate two hyperlipidemia mice models: ApoCIIItgGPIHBP1−/− and ApoCIII/GPIHBP1 DKO mice, respectively.