passages.id: split_4_test_2286_passage
passages.type: progene_text
passages.text: To relate the characteristics of GABA(A) receptors in cultured SVZa precursor cells to particular combinations of subunits , the open reading frames of the dominant subunits detected by RT - PCR ( alpha 2 - 4 , beta 3 , and gamma 2S ) were cloned into a mammalian cell expression vector and different combinations were transfected into Chinese hamster ovary - K1 ( CHO - K1 ) cells .