Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Intercorrelations between serum (pro and active) MMP‐9, NGAL and proMMP‐9/NGAL levels in healthy smokers (n = 15) (A‐C) and smokers with COPD (n = 46) (D‐F). Spearman's correlation coefficient (r) and the P‐value are shown. Spots are superposed in the COPD group.
