Fig. 2From: The dopamine receptor D4 regulates the proliferation of pulmonary arteries smooth muscle in broilers by downregulating AT1REffects of different concentrations of NaCl in drinking water on protein expression of proliferating cell nuclear antigen (PCNA), angiotensin II type 1 (AT1) receptor and dopamine receptor D4 (DRD4) in vascular smooth muscle of broilers. a Expression of PCNA protein (n = 6, **P < 0.01 vs. control). b Expression of AT1 receptor protein (n = 6, **P < 0.01 vs. control). c Expression of DRD4 protein (n = 6, **P < 0.01 vs. control)Back to article page