passages.id: split_4_test_2280_passage
passages.type: progene_text
passages.text: A set of complementary experiments was undertaken to determine by reverse transcription and polymerase chain reaction ( RT - PCR ) whether SVZa progenitor cells express the messenger RNA ( mRNA ) coding for glutamic acid decarboxylase 67 ( GAD67 ) , used in the synthesis of GABA and for GABA ( A ) receptor subunits .