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Table 3 Comparison of representative spectral tuning sites among teleost RH2 opsins

From: Evolutionary ecology of the visual opsin gene sequence and its expression in turbot (Scophthalmus maximus)

Tuning site 97 122 207 292
Spotted halibut
 RH2B S E M A
 RH2C T Q L A
Barfin flounder
 RH2B S E M A
 RH2C T Q L A
Atlantic Halibut
 RH2 S E M A
Japanese flounder
 RH2A1 S Q M A
 RH2A2 T Q M A
 RH2B S E M A
 RH2C S Q L A
Turbot
 RH2A1 S Q L A
 RH2A2 T Q M A
 RH2B1 S E M A
 RH2B2 S E M A
 RH2C S Q L A
Cichlids
 RH2Aα S E M A
 RH2Aβ S E M A
 RH2B S Q M A
Medaka
 RH2A S Q M S
 RH2B S E M A
 RH2C S Q M A
Guppy
 RH2-1 S E M A
 RH2-2 S Q L A
Zebrafish
 RH2-1 C Q M A
 RH2-2 C Q M A
 RH2-3 T Q M A
 RH2-4 T E M A
  1. Marked in Italics are two positively selected sites of RH2C