Table 1 Aromatic arginine (ar/R) selectivity filter of NbXIP1 isoforms, human and other plant aquaporin isoforms

NbXIP1;1s

I

C^a

V/T^b

A

R

NbXIP1;2s

A

C^a

V/T^b

A

R

NbXIP1;3

I

C^a

V/T^b

A

R

AtNIP1s, 2;1, 4s

W

S/T

V

A

R

AtNIP3;1

W

T

I

A

R

AtNIP5;1

A

T

I

G

R

AtNIP6;1

A

T

I

A

R

AtNIP7;1

A

T

V

G

R

AtTIP1s

H

F

I

A

V

AtTIP2s

H

H

I

G

R

AtTIP3s

H

F

I

A

R

AtTIP5;1

N

Y

V

G

C

HsAQP8

H

F

I

G

R

AtPIPs

F

N

H

T

R