Fig. (2) Serotonin 2b (5HT_2b) Receptor Immunostaining: (left) Representative images of 5HT_2b immunohistochemical images for sham (A) and NP-treated (B) 1 week after surgery (red=nuclei; green=positive staining; scale bar =100 µm). Increased expression was observed in NP-treated (** p<0.015) animals at 1 week after surgery, but returned to pre-operative levels by 4 weeks post surgery. Expression level at 1 week for NP-treated animals was significantly different from sham animals (*p <0.015). Data are presented as mean ± standard deviation.