Partial duplication of Taf3. The upstream copy can potentially encode the first 679 amino acids of Taf3 followed by 14 unrelated residues. In addition 21bp (comprising approximately half an RS(I-SceI) site) have been inserted, which results in seven amino acids being inserted between amino acids 341 and 342. The downstream copy should be non-functional as it lacks a promoter and the first exon. A w^+mW.hs marker (in inverted orientation with respect to direction of transcription of the Taf3 sequence) is inserted between the two copies.