Three types of opioid receptors have been cloned -- mu, delta, and kappa. Opioid receptors are seven transmembrane G-protein coupled receptors. They share a high degree of homology and are most divergent at the N- and C-termini. Activation of mu opioid receptors leads to a decrease in neuronal excitability. Several C-terminal splice variants have been identified for the Mu Opioid Receptor (MOR1) including MOR1C. These splice variants appear to differ in their pharmacological selectivity as well as their membrane trafficking.
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Image: A-D-Staining of Differentiated Stem Cells. D3 ES cells were maintained in serum/LIF/ME induced self-renewal conditions (undifferentiated cells, D3). Upon treatment with 1 µM RA they undergo differentiation (dD3). Cells were fixed and permeabilized. Treatments were followed by overnight incubation with polyclonal MOR-1 (C-terminus, 1:2500)