Strain that is descended from K-12. Escherichia coli str. K-12 substr. W3110

Escherichia coli strain W3110. This strain is closely related to MG1655 and is descended from K-12 (W1485) which is a derivative of the original K-12 strain (EMG2). It is considered a more wild-type strain than MG1655, although it has also been cured of the lambda prophage and lacks the fertility factor (F+ plasmid) of the original E. coli K-12 (EMG2). Comparison of the two genomes revealed that they are not identical with strain-specific differences reflecting their distinct lineages.