Agarose gel electrophoresis of PCR products. PCR products were subjected to agarose gel electrophoresis. Lane 1: 100–base pair (bp) DNA ladder. Base pairs are indicated. Lane 2: specific RT-PCR product. Lane 3: PCR analysis of RNA without RT (no-RT control). Lane 4: water control. (A) GAPDH. (B) Opioid μ1 receptor. (C) GABA B receptor. (D) 5-HT 1F receptor. (E) Adenosine A₂B receptor. (F) Purinergic P2X4 receptor. (G) Voltage-gated K⁺ channel SRS4. (H) Voltage-gated K⁺ channel SRS6. (J) Neurotrophin 3. (K) Synaptobrevin 1. (L) Dystroglycan α.