Fig. 1.

Schematic representation of MOPr-CT sequence and the mutants. The C terminus residues 340 to 398 of mouse wild-type MOPr are shown in single-letter amino acid codes. The potential phosphorylated residues predicted by software are italicized, whereas those identified by mass spectrometry are underlined. Mutants are named by the position and numbers of mutated residues. The letter A represents the corresponding serine/threonine residue being mutated to alanine, and dashes indicate unchanged residues.