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Table 2 CPs specific to water-dwelling species. CPs facing the extracellular side of the membrane are in bold.

From: Common peptides shed light on evolution of Olfactory Receptors

CP Domain # of occurrences
RYILF TM2 15
YGATGFYP TM2 6
AGFFPR TM2 11
LAYDRL IL2 9
YHSVM IL2 10
RLPLCG * EL2 17
KFMQTC IL3 8
ALKTC IL3 16
QTCVPH IL3 16
PPILNPL TM7 13
  1. Domains start from the N-terminal (N), through Transmembrane domains 1–7 (T1–T7), Intracellular loops (I1–I3) and extracellular loops (E1–E3) and end in the C-terminal (C)
  2. * – appears also in frog