When we started IXDB, we dumped the old ACeDB version first. In there, everything was a locus, and loci were contained in clones as the only possible relation. In this cases we never knew the probe, but the information is important anyway. So, we keep it, and are replacing it gradually by the real probes. It should be used from time to time to detect anbormailties.
Targets can currently only be clones .
Each match has also a intensity. This possibility is only theoretically at the moment, because the set of targets is nowhere described - though the databae structure for this would already be there. This is currently the only method. An intensity of 0 means that the match is variable - it sometimes appears and sometimes not. They are checked within a trigger before inserting or updating.