definiens: means the twelve ( 12 ) calendar day period following [COMPANY] ’s receipt of the CallOption Triggering Event Notice, provided that Bluebird may extend the Call Option Exercise Period as follows:(i ) in ten ( 10 ) day increments following the end of the then - existing by delivery ofwritten notice to [COMPANY] at any time prior to the fifth ( 5 ) day prior to the expiration of such Call Option ExercisePeriod ( as it may be extended from time to time ), and ( ii ) the extensions, when aggregated together, may not exceed240 days in the aggregate . In the event the Call Option Exercise Period is extended as provided in the immediately thCERTAIN CONFIDENTIAL PORTIONS OF THIS EXHIBIT WERE OMITTED AND REPLACED WITH . ACOMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE SECRETARY OF THESECURITIES AND EXCHANGE COMMISSION PURSUANT TO AN APPLICATION REQUESTING CONFIDENTIALTREATMENT PURSUANT TO RULE 406 PROMULGATED UNDER THE SECURITIES ACT OF 1933, AS AMENDED