Table 2.

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

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

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)

* – appears also in frog