CGSC Strain#: 5044
Strain Designation: JM70      Source of Strain: M.C. Jones-Mortimer
Sex: F- Chromosomal Markers: thr-1, leuB6(Am), fhuA2, lacY1, glnV44(AS), gal-6, λ^-, trp-1, hisG1(Fs), rpsL99(strR), malT1(λ^R), xyl-7, mtlA2, cysE52, ΔargH1, thiE1
Strain Comments:

• This strain is sensitive to cysteine: use cystine instead.
• leuB6(Am)-- Suppressed by serU suppressor (supH)
• glnV44(AS) was formerly called supE44
• glnV44(AS) was formerly called su⁺_II
• thiE1 was formerly called thi-1
• xyl-7 was formerly called xylA7
• Am = amber(UAG) mutation
• AS = amber(UAG) suppressor
• Fs = Frameshift mutation
• LamR = Lambda-resistant
• strR = streptomycin resist.

References:

• Jones-Mortimer, MC 1968. Positive control of sulphate reduction in Escherichia coli. Isolation, characterization and mapping oc cysteineless mutants of E. coli K12. Biochem. J. 110(3):589-95.