Figure 2. Photomicrographs showing gingiva stained with anti-CD34. (a) Few small CD-34-positive vessels in the control group (n = 8) (40X). (b) The nifedipine group (n = 17) shows an increase in small capillaries and some thick-walled vessels (40X). (c) The cyclosporin group (n = 7) shows an increase in small vessels (40X). (d) Histogram showing significantly higher numbers of vessels/mm² for the cyclosporin group compared with the control and nifedipine groups (*p < 0.05). The data are expressed as the mean ± SD.