All possible appearances of a local cycle in a locus graph. The dotted line represents the non-tree edge e. (a) The local cycle appears with cycle constraint (bc, e). (b) There is only one path containing e with path constraint (nc, nd, bp, e). (c) There is only one path with tree constraint (nc, nd, bt). (d) There are only four predetermined nodes without any constraint.
Lai et al. BMC Bioinformatics 2012 13(Suppl 17):S19 doi:10.1186/1471-2105-13-S17-S19