CGSC Strain#: 257
Strain Designation: Hfr 4000     
Source of Strain: Pasteur Institute
Other Designations: AB257
Other Designations: Hfr P3
Sex: Hfr
Point of Origin#: 2B
Map Position: 12.20
Direction of Marker Transfer: Counterclockwise
Chromosomal Markers: relA1,
spoT1,
metB1Strain Comments: - This is not the Cavalli Hfr.
- spoT1-- In addition to the 6bp insertion, there is a C to T transition resulting in an H257Y substitution.
References: - Jacob, F., E. Wollman 1957. Analyse de groupes de liaison genetique de differentes souches donatrices d'Escherichia coli. Compt.Rend.Acad.Sci.Paris 245:1840-1843
- Pardee, A.B., F. Jacob, J. Monod 1959. The genetic control and cytoplasmic expression of "inducibility" in the synthesis of B-galactosidase by E. coli. J.Mol.Biol. 1:165-178
- Jacob, F., S. Brenner, F. Cuzin 1963. On the regulation of DNA replication in bacteria. Cold Spr.Harb.Symp.Quant.Biol. 28:329-348