CGSC Strain#: 6630
Strain Designation: XA21      Source of Strain: J.R. Beckwith
Sex: F- Chromosomal Markers: ΔlacZ58(M15), lacI22, λ^-, rpsL135(strR), malT1(λ^R), xyl-7, mtlA2, thiE1
Strain Comments:

• lacI22 is the Jacob allele lac_i3.
• ΔlacZ58(M15)-- is a deletion of a small part (the alpha region) of the lacZ gene; allows `alpha complementation'.
• lacI22 was formerly called lac_i3^-
• lacI22 was formerly called lacI3
• ΔlacZ58(M15) was formerly called deletion M15
• ΔlacZ58(M15) was formerly called lacZ(M15)
• thiE1 was formerly called thi-1
• xyl-7 was formerly called xylA7
• LamR = Lambda-resistant
• M15 = alpha-complemented allele
• strR = streptomycin resist.

References:

• BRIL-PETERSEN, E, HG WESTENBRINIK 1963. A STRUCTURAL BASIC PROTEIN AS A COUNTERPART OF DEOXYRIBONUCLEIC ACID IN MAMMALIAN SPERMATOZOA. Biochim. Biophys. Acta 76:152-4.
• BECKWITH, JR 1964. A DELETION ANALYSIS OF THE LAC OPERATOR REGION IN ESCHERICHIA COLI. J. Mol. Biol. 8:427-30.
• Brenner, S., J.R. Beckwith 1965. Ochre mutants, a new class of suppressible nonsense mutants. J.Mol.Biol. 13:629-637