CGSC Strain#: 5004
Strain Designation: XA2      Source of Strain: Brenner and Beckwith
Sex: F- Chromosomal Markers: lacZ13(Oc), lacI22, λ^-, tyrT70(OS), rpsL135(strR), malT1(λ^R), xyl-7, mtlA2, thiE1
Strain Comments:

• tyrT70 is Brenner's su_C⁺.
• lacZ13(Oc)-- is lacZ₂ of Jacob, originating in Paris strain 3.320. It is an ochre, polar mutation.
• lacI22 was formerly called lac_i3^-
• lacI22 was formerly called lacI3
• thiE1 was formerly called thi-1
• tyrT70(OS) was formerly called su_C⁺
• tyrT70(OS) was formerly called supC70
• xyl-7 was formerly called xylA7
• LamR = Lambda-resistant
• Oc = ochre(UAA) mutation
• OS = ochre(UAA) suppressor
• strR = streptomycin resist.

References:

• Brenner, S., J.R. Beckwith 1965. Ochre mutants, a new class of suppressible nonsense mutants. J.Mol.Biol. 13:629-637