Expression of GABAergic transmission input components. RT-PCR analysis of GABAA receptor subunits (α1-6, β1-3, γ1-3, δ, ɛ, θ, π, and ρ1-3) and GABAB receptor subtypes (B1 and B2) of ESC (A) and ECSC (B). ESC, embryonic stem cell; ECSC, embryonal carcinoma stem cell; RT-PCR, reverse transcriptase–polymerase chain reaction.