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Table 1 Summary of domain structures and expression evidence for LIM homeobox genes found in four early animal genomes

From: Early evolution of the LIM homeobox gene family

Subfamily Nematostella Hydra Trichoplax Amphimedon
  Domains Expressed Domains Expressed Domains Expressed Domains Expressed
Apterous (Lhx2/9) L-L-H Y L-L-H Y L-L-H Y - -
Arrowhead (Lhx6/8) L-L-H Y L-H Y L-L Y - -
Islet L-L-H Y - - L-L-H - L-L-H Y
lin-11 (Lhx1/5) L-L-H Y L-L-H Y L-L-H Y L-L-H Y
Lhx3/4 L-L-H N - - L-L-H - L-L-H Y
Lmx L-H Y L-L-H Y L-L-H - - -
  1. H = homeodomain; L = LIM domain; N = not found to be expressed by reverse transcription polymerase chain reaction (RT-PCR); Y = expressed.