All IP experiments were performed using IPN tissue obtained from prepubescent mice and rats (17–19 days of age) following decapitation. The protocols for solubilizing, isolating and labelling the receptors with [3H]-epibatidine were as published previously (David et al., 2010 (link); Scholze et al., 2012 (link)). Here, we used standardized Pansorbin cells (catalog number 507861; Calbiochem, Merck-Millipore, Darmstadt, Germany) for IP and the bicinchoninic acid protein assay reagent kit (Thermo Scientific Pierce, Rockford, IL, USA) for protein quantification.
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