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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