Table 1. Key to ribosome hibernation factors.

Name used here (explanation)	YfiA† (name of gene)	RMF (ribosome modulation factor)	HPF† (hibernation promoting factor)
Alternate names	pY, RaiA		YhbH
Associated with	Ribosome monomer	Dimer	Dimer

^†The sequences of the genes encoding both of these proteins have often been annotated as ‘sigma modulation factor’.