Fig 7. Scanning electron micrographs of A549 cells.

A549 cell morphology was composed of many cell types: 1) the mature form with (A) and without granules (B) were the largest cells with an irregular and granulate surface; 2) the progenitor form consisted of small and rounded cells with a smooth and irregular membrane (C) and 3) apoptotic cells (D) are the shrunken cells with numerous vacuolated membranes. Cells stained with trypan blue cells were shown in the inset of each micrograph.