Figure 2.

Effects of doxycycline hyclate (Dx) on cell viability. (a) RAW264.7 macrophages were treated with various doses of Dx (10, 30, 100, and 300 μg/mL) for 24 h. (b) Representative photomicrographs showing cells in cultured medium (control group) and 300 μg/mL Dx added to the medium (phase-contrast microscopy, bar = 200 μm). The results are presented as the percentage absorbance of the control group. The data are expressed in the graphics as a mean and standard deviation. ^∗Statistical difference compared to control cells (Student-Newman-Keuls test, p < 0.05).