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B0002430 Credit Audio Visual, LSHTM, Wellcome Images
Hand holding petri dish of recombinant organisms
Hand wearing a latex glove and holding a petri dish of E. coli. The
blue colour allows easy selection of recombinant
plasmids. The blue colonies contain the parental
plasmid which has a gene for the beta-
galactosidase protein incorporated into it. This
converts a substrate to the blue dye. If an extra
piece of DNA is inserted into the plasmid (a
recombinant plasmid) this enzyme is disrupted and
no blue dye is produed and the colony appears
white.
Collection: Wellcome Images
Library reference no.: TASS

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