Analysis of eight known related genes regulated by TLR4 by strain. In order to verify our hierarchical clustering, we plotted the average fold change values of eight highly expressed TLR4-related genes (KC-GRO, MIP-2, TNF-α, IL-1β, CD14, IL-6, MyD88, and IL-1α) by strain and time. Data are expressed as means ± SEM (an * denotes a P value of <0.05 compared to C57BL/6 mice).