TY  - RPRT
TI  - The extracytoplasmic function (ECF) sigma factors.
AU  - John D Helmann
PY  - 2002
DO  - 10.1016/s0065-2911(02)46002-x
UR  - https://pubmed.ncbi.nlm.nih.gov/12073657/
ID  - 12073657
ER  -