Table 2.

Overview of MPP concentrations used for proliferation tests, flow cytometry, and ROS assays. For all particle sizes, a low and high concentration, depending on the particle size, was applied. Low concentration =  < 1% coverage of the plate; medium concentration = 1–10% coverage of the plate; high concentration = 20–30% coverage of the plate.

Particle size	Low concentration (particles/cell)	High concentration (particles/cell)
0.2 µm	10	100,000
0.5 µm	10	10,000
1 µm	10	1000
2 µm	10	400
3 µm	10	100
6 µm	2	25