Molecular cloning generally uses DNA sequences from two different organisms: the species that is the source of the DNA to be cloned, and the species that will serve as the living host for replication of the recombinant DNA.
A clonación molecular usa xeralmente secuencias de ADN procedentes de dous organismos distintos: a especie que é a fonte do ADN que se vai clonar, e a especie que servirá como hóspede vivo para a replicación do ADN recombinante.