Matrigel invasion by U87MG, FEMX-I, MDA-MB-231, and MA11 tumor cell lines.

<p>Fluorescence microphotographs of representative areas of the underside of matrigel-coated membranes in transwell assays, showing that U87MG and MDA-MB-231 invade more efficiently through the matrigel, roughly by 4- and 7-fold, respectively, than MA11 and FEMX-I. The cells were fluorescently labeled with 4′,6-diamidino-2-phenylindole, appearing dark in the inverted images. Bars, 100 µm.