Data items in the STRUCT_NCS_DOM category record information
about the domains in an ensemble of domains related by one or
more noncrystallographic symmetry operators.
A domain need not correspond to a complete polypeptide chain;
it can be composed of one or more segments in a single chain,
or by segments from more than one chain.
Example 1 - based on laboratory records for the collagen-like
d1 'Chains A, B, and C'
d2 'Chains D, E, and F'
Key Category Items
Items in Category struct_ncs_dom