A member of the dormancy regulon. Induced in response to reduced oxygen tension (hypoxia), low levels of nitric oxide (NO) and carbon monoxide (CO). It is hoped that this regulon will give insight into the latent, or dormant phase of infection. No visible phenotype under normal or hypoxic and normoxic stationary phase growth, nor in mouse- or human-derived macrophage cell lines. Belongs to the universal stress protein A family.