Lambda Bacteriophage
Lambda bacteriophage has been a workhorse of molecular biology for decades. Itis vital in the fields of molecular cloning and genomic sequencing since it can be used to subclone very long genomic DNA fragments much more efficiently than plasmid vectors. Lambda DNA comes from a bacterial virus, or bacteriophage, which attacks bacteria by injecting them with its nucleic acid. Once inside, Lambda DNA hijacks the bacterial cellular machinery and replicates itself until the cells burst, releasing millions more bacteriophage to carry out the same infection process. Bacteriophage lambda is harmless to humans and other eukaroytic organisms, and therefore makes an excellent source of DNA for experimental study.