- σ19 (FecI) - the ferric citrate sigma factor, regulates the fec gene for iron transport.
- σ24 (RpoE) - the extracytoplasmic/extreme heat stress sigma factor.
- σ28 (RpoF) - the flagellar sigma factor.
- σ32 (RpoH) - the heat shock sigma factor, it is turned on when exposed to heat.
- σ38 (RpoS) - the starvation/stationary phase sigma factor.
- σ54 (RpoN) - the nitrogen-limitation sigma factor.
Find a Golden Butterfly for a Chance to Win!
Help us celebrate our 50th anniversary! We have hidden 1,000 golden butterflies and are waiting for you to find them. They can be anywhere that you find NEB! Beginning April 15th, be sure to visit our website and tables at tradeshows and events you are attending. Visit our social media channels frequently for tips on where we have hidden the butterflies – and once you find one, either click or scan the code to be eligible for a 50th anniversary prize pack, as well as a grand prize trip to NEB headquarters in Ipswich, MA!.
