TABLE I.

Linker Region of Tandems

Tandem	C′ domain	Linker	Signal peptide	Total
α3_β4	9	15	21	45
β4_α2	19	15	29	63
β4_α3	19	15	26	60
β4_α4	19	15	28	62
β4_α6	19	15	25	59
β2_α2	23	15	25	63
β2_α3	23	15	29	67
β2_α4	23	15	28	66
β2_α6	23	15	25	63

Linker region from presumed −NH₂ end of TM4 region (extracellular region) of the first subunit up to start of the mature second subunit.