passages.id: split_4_test_1520_passage
passages.type: progene_text
passages.text: In blood perfused rat lungs we studied protective role of NO against injury inferred by lipopolysaccharide on pulmonary microcirculation that was accomplished by thromboxane A2 ( TXA2 ) , platelet activating factor ( PAF ) , cysteinyl - leukotrienes ( cyst - LTs ) and the complement system .