MEDICAL DICTIONARY
Yeast artificial chromosome (YAC): A vector (carrier) created and used in the laboratory to clone pieces of DNA.
A YAC is constructed from the telomeric, centromeric, and replication origin sequences needed for replication in yeast cells. (The telomere is the end of the chromosome; the centromere is the chromosome region to which spindle fibers attach during cell division; and the replication origin sequences are the spots where the replication of DNA starts.)
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