Figure 2. Effects of l-arginine deprivation and stimulation on apoptosis in fibroblasts.

(A) Apoptosis was measured using the TUNEL assay in l-arginine-deprived and -treated fibroblasts. (B) Quantification of the data from (A). **p<0.01, as compared with the control group (Student’s t test). (C) The number of cell death using the 0.1% trypan blue staining in l-arginine-deprived and -treated fibroblasts. **p<0.01, as compared with the control group (Student’s t test).