Figure 4.

NH2-terminal intracellular β1 interacting with the S0–S1 intracellular loop; and between the S3–S4 extracellular loop of the α subunit and TM2 of the β1 subunit. The α and β1 subunits are shown in green and blue, respectively. (A) Glutamic acid 149 (B) Arginine 11.