TLR4 and bronchiolitis: Children with prior bronchiolitis in infancy who were carriers of the common homozygous TLR4 haplotype (Asp/Asp+Thr/Thr) produced marginally higher levels of IL-10 than did carriers of the heterozygous haplotype (Asp/Gly+Thr/Ile) if their cells were stimulated at the higher concentration (0.5 ng/ml) of LPS (p<0.04) (Figure S2).