Inhibition of A549 cell viability by trypacidin.

<p>A549 cells were exposed for 1 h and 2 h with 10 µM and 50 µM trypacidin, then the medium containing trypacidin was replaced by fresh medium and cell viability was measured 24 h later using MTT assay. Cells were also exposed to trypacidin for 24 h before the MTT assay.