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<PAGE> EXHIBIT 23.5 [FRONT LINE LETTERHEAD] October 5, 2000 To Whom it May Concern: Front Line Management Consulting, Inc., authorizes AeroGen, Inc. to use any information from Front Line's 1997 Respiratory Diseases and Therapeutics market research report for AeroGen's S-1 form, Number 333-44470. /s/ TROY M. FRANEY ---------------------------------------- Authorized Signature Director, Business Development--Marketing ---------------------------------------- Title
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