text: user1852: I was browsering the UCSC viewer of the genome at this region.
  UCSC genes label two genes as Hba-a2 while GENCODE thinks the left one is Hba-a1
  Which annotation is correct?
  
  user77: Gencode is correct (when in doubt, always assume Gencode/Ensembl is correct when it differs from UCSC). What presumably happened is that the UCSC annotation pipeline noticed that Hba-a1 and Hba-a2 are nearly identical (they produce the same protein and have minimal nucleotide difference) and just misannotated.
  
original_text: 1852: <p>I was browsering the UCSC viewer of the genome at <a href="https://genome.ucsc.edu/cgi-bin/hgTracks?db=mm10&amp;lastVirtModeType=default&amp;lastVirtModeExtraState=&amp;virtModeType=default&amp;virtMode=0&amp;nonVirtPosition=&amp;position=chr11%3A32271127%2D32368934&amp;hgsid=650939229_Ph2CmqBGLyApOC2IRsw66VU7fSYT" rel="nofollow noreferrer" title="Genome position">this region</a>.</p>
  
  <p>UCSC genes label two genes as Hba-a2 while GENCODE thinks the left one is Hba-a1</p>
  
  <p>Which annotation is correct?</p>
   77: <p>Gencode is correct (when in doubt, always assume Gencode/Ensembl is correct when it differs from UCSC). What presumably happened is that the UCSC annotation pipeline noticed that Hba-a1 and Hba-a2 are nearly identical (they produce the same protein and have minimal nucleotide difference) and just misannotated.</p>
  