A @D01597@ molecule (e.g. @P04689@ ) that is able to replicate in two different @H02859@ organisms and can therefore be used to 'shuttle' or convey @G02604@ from one to the other.
Source: PAC, 1992, 64, 143. (Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)) on page 165 [Terms] [Paper]