Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12967-019-1994-0/MediaObjects/12967_2019_1994_Fig22_HTML.png)
Cell index of MCF-7 and MDA-MB-231 cells. In MCF-7 cells, a decrease of the cell index over up to 120Â h was observed, whereas in the MDA-MB-231 cells, the cell index had decreased over the course of 24Â h before it finally increased. The control substance PO4-AM3 showed no effect on the cell index