definiens: means any compound for which the com position, manufacture or use thereof ( a ) is claimed by or otherwise described in any of the Tra nsferred Patents, ( b ) is claimed by any Derived Pat ent or ( c ) arises out of, is derived from or otherwise rel ates to any Transferred Know - How ( where such Transf erred Know - How is documented as of the Closing Date and d elivered to the Buyer pursuant to this Agreement, whether before, on or after the Closing Date ), in e ach case including any such compound that is a mess enger RNA compound, lipid compound, lipid combination ( e. g., three - lipid combination, four - lipid combination ), or that includes any 68 particular untranslated region ( UTR ) sequences . For the avoidance of doubt, any compound that satisfie s clause ( a ) or ( b ) of this definition shall continue to be an MRT Compound for purposes of this Agreement afte r the applicable Transferred Patent or Derived Patent tha t claims or describes the composition, manufacture or use of such compound expires or is otherwise no longer in force and effect ; provided that nothing in this sen tence shall be construed to extend the Earn - Out Period applicab le to any MRT Product containing such MRT Compound