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RELATED PARTY TRANSACTIONS	12 Months Ended
RELATED PARTY TRANSACTIONS	Dec. 31, 2017
RELATED PARTY TRANSACTIONS.
RELATED PARTY TRANSACTIONS	18. RELATED PARTY TRANSACTIONS In January 2017, the Company entered into a consulting agreement with Dr. Robert Langer, a member of our Scientific Advisory Board, who at the time of entering into the consulting agreement was a holder of over 5% of the Company’s common stock, for certain consulting services. Dr. Langer was one of the original co-founders of the Company. Pursuant to the terms of the agreement, the Company initially agreed to pay Dr. Langer $250 per year in consulting fees, but that amount was reduced effective October 2017 to $100 per year in consulting fees. For the year ended December 31, 2017 the Company paid Dr. Langer $204 in consulting fees.