Figure 4 Elevated levels of MMP‐12 protein in induced sputum from COPD patients (n = 28) compared with never smokers (n = 20), healthy smokers (n = 14), and former smokers (n = 14). Horizontal bars represent median values.
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.