ALL-ORTHOLOGS-OF	Returns the set of proteins common amongst all available organisms
COMMON-ORTHOLOGS-OF	Returns the set of protein common amongst all members of a set of organisms
CROSS-SUBSETS	Returns all possible pairs derived from two given sets
INTERSECTION-OF	Returns intersection of two or more sets
LENGTH	Returns number of elements of a set
ORTHOLOGS-OF	Returns the set of proteins common amongst a set of organisms
SET-DIFFERENCE	Returns all elements in one set that are not in a second set
UNION-OF	Returns union of two or more sets

See also List Functions.