3.4.21.B30	up	cellular level of UmuD increases approximately 10fold upon SOS induction	
3.4.21.B30	up	UmuD2 is up-regulated as part of the SOS response	
3.4.21.B30	up	the enzyme is expressed shortly after the induction of the SOS response	
3.4.21.B30	up	the mutant two complete umuDC operons (A1S_0636-A1S_0637 and A1S_1174-A1S_1173) and one unlinked umuD homolog (A1S_1389) determined in strain ATCC 17978 are induced by DNA damage and Rif