Figure 2

Viability of human lung explants exposed to cigarette smoke extract (CSE). Human lung explants were cultured with different concentration of cigarette smoke extract for 3 h, 6 h, 12 h and 24 h. The level of lactate dehydrogenase (LDH) in culture supernatant was assayed. The results are presented as OD value, were corrected for total protein concentration.