They are the core objects of the database. These restrictions will be mentioned below.
Clones can be of different types.
However, the type of the clone is only important for the representation and has no consequence in the database. Clones are usually arrayed in libraries . The physical parameters of a clone, like host, restistance, vector etc. are described through the library. One example is out own CX - YAC Collection . We call A and B aliases .