A standard immunohistochemical process was carried out as described in our recent studies (Gu & Lee, 2009). #links# Briefly, tissue sections were pre-incubated for 1 h at room temperature with 5% normal donkey serum in 0.01 m PBS to block non-specific protein-binding sites. Then the sections were incubated overnight at 4��C with mouse anti-CaSR monoclonal antibody (1:500 dilution; MA1-934;