Figure 8 - full size

 

Figure 8.
Figure 8. Schematic presentation of B-barrels. Takig a -barrel as non-ideal cylinder, a and b represent the major and mior axes of the elliptical cross-section of the arrel while h is the height. Angle 0 is the tilted angle etween /l-strands and the barrel axis. A right-handed arrel has < 90'' while a left-handed barrel has fI > 90''.

The above figure is reprinted by permission from Elsevier: J Mol Biol (1992, 228, 539-550) copyright 1992.