Cell morphology of the H357 cell line after 24- and 48-hour treatment. A and E Untreated control. B and F Treated with 1 ηg/ml EPR. C and G Treated with 10 ηg/ml EPR. D and H Treated with 20 ηg/ml EPR. The cells were assessed under low magnification (20x) phase contrast microscopy for any changes in morphology between the treated groups and the untreated control within each timeline, between the treated groups and between the two timelines of treatment. The cells were assessed in terms of size, shape, nuclear and cytoplasmic changes.