For cells of the innate immune system to mount a host defence response to infection , they must recognize products of microbial pathogens such as lipopolysaccharide ( LPS ) , the endotoxin secreted by Gram-negative bacteria .
for cells of the innate immune system to mount a host defence response to infection , they must recognize products of microbial pathogens such as lipopolysaccharide ( lps ) , the endotoxin secreted by gram-negative bacteria .
O O O O B-body_part I-body_part I-body_part O O O O O O O O O O O O O O B-mono_cell I-mono_cell O O B-lipid O B-lipid O O O O O O B-mono_cell I-mono_cell O