Fragment of DNA from the human genome inserted into a yeast cell. The yeast replicates the fragment along with its own DNA. In this way the fragments are copied to be preserved in a gene library. YACs are characteristically between 250,000 and 1 million base pairs in length. A cosmid works in the same way.
The temple of Angkor Wat had five towers but often only three are depicted. Red and blue recall the earlier flags of Cambodia. Effective date: 20 June 1993.