passages.id: split_4_test_2283_passage
passages.type: progene_text
passages.text: By comparison , the P0 olfactory bulb expressed all of the subunits detectable in the SVZa and additional subunit mRNAs : alpha 1 , alpha 5 , gamma 1 , gamma 2L ( long form ) , gamma 3 , and delta subunit mRNAs .