text: user9: The chromosome sizes at UCSC don't seem to contain chr29:
  ftp://hgdownload.soe.ucsc.edu/goldenPath/galGal5/bigZips/galGal5.chrom.sizes
  It has a chr28 and a chr30. Am I missing something or is there some piece of history that led to the omission of this chromosome?
  
  user2388: The current ensembl entry doesn't have a 29 either.  The archived ensembl assembly  lacks 29 30, and 31 and 33 and LGE64.
  The chromosomes after 30 are tiny, so they might not be visible in a karyotype.  They probably realized that "chr 29" was really attached to some other chromosome.
  
original_text: 9: <p>The chromosome sizes at UCSC don't seem to contain chr29:</p>
  
  <p><a href="ftp://hgdownload.soe.ucsc.edu/goldenPath/galGal5/bigZips/galGal5.chrom.sizes" rel="nofollow noreferrer">ftp://hgdownload.soe.ucsc.edu/goldenPath/galGal5/bigZips/galGal5.chrom.sizes</a></p>
  
  <p>It has a chr28 and a chr30. Am I missing something or is there some piece of history that led to the omission of this chromosome?</p>
   2388: <p>The current ensembl entry doesn't have a 29 either.  The archived ensembl assembly  lacks 29 30, and 31 and 33 and LGE64.</p>
  
  <p>The chromosomes after 30 are tiny, so they might not be visible in a karyotype.  They probably realized that "chr 29" was really attached to some other chromosome.</p>
  