BiFC reveals abundant heteromeric GABABRs at the plasma
membrane. A, 9–14 DIV rat hippocampal neurons grown in
culture were cotransfected with Myc-GABABR1-YFP-N and
HA-GABABR2-YFP-C. Neurons were fixed and labeled with antibodies to
the N-terminal Myc epitope in GABABR1 to detect surface
GABABRs (red). GABABR-BiFC was detected without
staining (green). Merged images are shown on the right. B,
same as above for neurons labeled with anti-KDEL antibodies to detect the ER.
C, same as above for neurons labeled with anti-GM130 antibodies to
detect the Golgi apparatus. Cell bodies are shown on top and
dendrites below. Scale bars A–C: somas, 10 μm; dendrites, 5
μm.