1. (in biotechnology) A @D01597@ molecule (@P04689@, virus, bacteriophage, artificial or cut @D01597@ molecule) capable of being replicated and bearing cloning sites for the introduction of foreign @D01597@, used to introduce this @D01597@ into host cells.
  2. Any organism that transmits a disease between two hosts.
PAC, 1992, 64, 143. (Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)) on page 168 [Terms] [Paper]