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![[Figure 3]](ba0002fig3mag.jpg)
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Figure 3
Topology cartoons of the two domains of chain A of 1ber. β-strands are represented by triangular symbols and α-helices by circular ones with the peptide chain following the connecting lines between symbols. In domain 1, the chain runs from N1 to C2, while in domain 2 it runs from N2 to C3. The relative direction of β-strands is shown by the orientation of the triangles. Strands are viewed as having one of two directions: `up' strands are shown as upward pointing triangles and should be thought of as representing strands directed out of the plane of the diagram; `down' strands are shown as downward pointing triangles and represent strands directed into the plane of the diagram. The directions of the helices can be deduced by studying how connecting lines are drawn: if the N-terminal connection is drawn to the centre of the symbol and the C terminal one to the edge then the direction is down, otherwise if the N-terminal connection is drawn to the edge and the C-terminal one to the centre and the direction is up. |
![[Figure 3]](ba0002fig3.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
