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Prior to making a determination on the request for reexamination , the examiner must request a litigation computer search by the Scientific and Technical Information Center ( STIC ) to check if the patent has been , or is , involved in litigation . Note that if the sequence lacked complexity , it could easily have happened by chance . A commercial colorimetric kit ( Calbiochem ) was also evaluated for GSH . See MPEP Section 2240 and Section 2242 for handling of requests for reexamination of patents involved in litigation . But because the artifacts themselves were so familiar to us , the essential differences were disguised behind them , and only when a more basic consideration of different perceptions of the world was made did the picture come into focus . Plants and foods produced using biotechnology are among the most stringently tested in history . Reexamination proceedings not involved in litigation will have priority over all other cases except reexaminations or reissues involved in litigation .