CGSC Strain#: 4232
Strain Designation: Ra-1      Source of Strain: M.C. Cappello
Sex: Hfr    Point of Origin#: 52   Map Position: 65.00   Direction of Marker Transfer: Clockwise
Chromosomal Markers: glnV42(AS), λ^-, malB28(λ^R), λ^R
Strain Comments:

• This strain also carries the sex factor attachment site at the point of origin of strain Ra-2. This property is designated sfa-5.
• λ^R-- Lambda resistant, locus unknown.
• glnV42(AS) was formerly called supE42
• AS = amber(UAG) suppressor
• LamR = Lambda-resistant

References:

• Joset, F., B. Low, R. Krisch 1964. Induction by radiation of a new direction of chromosome transfer during conjugation in an Hfr strain of Escherichia coli. Biochem.Biophys.Res.Commun. 17:742-747
• Low, K.B. 1967. Inversion of transfer modes and sex factor-chromosome interactions in conjugation in Escherichia coli. J.Bacteriol. 93:98-106