Table 2. Explanation of the compatibility relationship using the lock-key-model.

	wTei		wRi		wHa		wNo		wMel		wCer2
factor	mod	resc	mod	resc	mod	resc	mod	resc	mod	resc	mod	resc
1	L	K			L	K	L	K			L	K
2	L	K	L	K							?
3		K	L	K					L	K	?
4				K	L	K			L	K	?
5							L	K			?

Presence of locks is indicated by “L”, presence of keys “K”, unknown relationships by question mark. A strain rescues another strain if all its keys match the other's locks.