Table 1.

Notations in the algorithms

v.ali	Whether the protein v is already aligned. The initial value is false.
N (v)	{v'|v' is the neighbor of v and v'.ali = false}
Net(v)	The network where protein v is in.
S(v)	The match-set containing protein v.
Net(S(v))	The networks where at least one protein in S(v) is in.