Fig. 4.

Three weakly active Gβ subtypes.A–D, Current records for uninjected control cell (A) and neurons injected with 100 ng/μl Gβ₃, Gβ₄, or Gβ₅ DNA (B–D). To accentuate possible weak actions by Gβ₃, Gβ₄, and Gβ₅, the concentration of the reporter plasmid (pEGFP-N1) was decreased tenfold to 10 ng/μl, and NE was decreased to 2 μm.E–G, Summary data for facilitation ratio, inhibition by NE, and current density in these cells. Note that the axes have been expanded to reveal smaller differences.