Given the task definition and input, reply with output. In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

 OBJECTIVE : To examine whether inhaled nitric oxide ( NO ) affected the intrapulmonary production of NO , reactive oxygen species , and nuclear factor - kappaB in a lipopolysaccharide ( LPS ) - induced model of acute lung injury .

nuclear factor