• Returns orthologs common to all organisms in the given list
• If a PRIMARY organism is specified, the common orthologs are given in terms of that organism; otherwise the first organism in the list is used
• Given-organisms may be given as a single variable holding a list or as multiple organisms between parentheses
• "Ortholog" is operationally defined through the ORTHOLOG-OF function with the threshold set to 1e-10
• Since the lists are precomputed (so that results are returned almost instantaneously), the threshold cannot be changed. If you want a different threshold, use ORTHOLOG-OF within a loop.

Example:
  (COMMON-ORTHOLOGS-OF *loaded-organisms* PRIMARY S6803)

          [Result is a list of proteins within Synechocystis PCC6803 with orthologs in all cyanobacteria
            known to BioBIKE

Example:
  (DEFINE het-core-genes AS (COMMON-ORTHOLOGS-OF (Npun A7120 Avar) DISPLAY off)

          [Result is a list of proteins within N. punctiforme with orthologs found in Anabaena PCC7120
            and A. variabilis