passages.id: split_4_validation_799_passage
passages.type: progene_text
passages.text: The level of sigma(H) protein was reduced by the addition of NaCl , while the expression of spo0H , which encodes sigma ( H ) , was little affected , indicating that posttranscriptional control of sigma(H) rather than spo0H transcription is affected by the addition of NaCl in the shaA mutant .