Numbers of Retn and Retnl genes found in groups of vertebrate species.

1 Number of species examined / number of species with a Retn or Retnl gene / number of species with at least one intact Retn or Retnl coding sequence for each group.2 Genomic sequences that fail to predict part of a Retn or Retnl gene sequence, possibly due to a gap in the genome assembly.3 Sequence contains mutations that cause a frame shift or introduce premature stop codons in the Retn or Retnl coding sequence.Numbers of Retn and Retnl genes found in groups of vertebrate species.