Human Neutrophil Elastase from Innovative Research was used in the following study:
Jie Zhang, Hao-Yang Xu, Yu-Juan Wu, Xing Zhang, Liu-Qiang Zhang, Yi-Ming Li
Journal of Ethnopharmacology
Volume 242, 5 October 2019, 111713
"... HNE (EC 3.4.21.37) from purulent human sputum was obtained (Innovative Research Company, Novi, MI, USA). HNE substrate (MeO-Suc-Ala-Ala-Pro-Val-pNA), soybean trypsin inhibitor, LPS, rhodamine 123, verapamil, and dimethyl sulfoxide (DMSO) were also obtained ..."