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Formation of disulfide cross-linked homodimers between mutant M3Rs containing Cys substitutions within the H8 helix. Cross-linking and Western blotting experiments were carried out as described in the legend to Fig. 2. As a positive control, we included the L264C-M3′(3C)-Xa construct (16). Representative Western blots are shown. Similar results were obtained in two or three independent experiments. Asterisks, putative receptor monomers; arrows, putative cross-linked receptor dimers.
