passages.id: split_6_test_3536_passage
passages.type: progene_text
passages.text: We have found that substitution of an arginyl residue for the glutamyl residue at position 196 of sigma A ( Glu-196---- Arg ) suppresses the deleterious effect of a thymidine - to - cytidine base substitution at position - 11 in the spoIIG promoter .