used to describe DNA that has been “recombined” from more than 1 source through molecular cloning and/or the proteins expressed from such DNA. For example, you can take the gene for a protein you want to study out of one place (either cut it out with restriction enzymes or use PCR to make lots of copies of it with special ends) and paste it into a plasmid (a circular piece of DNA that comes from a bacteria-infecting virus called a phage). That plasmid serves as a vector (“vehicle”) for getting that “insert”-ed gene into cells and getting protein made from it. That DNA, and the protein made from it are referred to as recombinant.