| abstract |
A procaryotic microorganism and a method for its production is provided wherein the microorganism contains at least one stable foreign DNA portion in the chromosome. The disclosed microorganisms and their progeny are substantially free of genetic rearrangement involving the foreign DNA. In a preferred embodiment, cyanobacteria are employed. The microorganisms are produced by introducing into the cell an insertion vehicle that contains foreign DNA ligated between two portions of DNA homologous to adjacent portions of the recipient's chromosome. |