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Distribution Agreements	12 Months Ended
Distribution Agreements	Dec. 31, 2013
Distribution Agreements
Distribution Agreements	17. Distribution Agreements *U.S.-Based Specialty Pharmaceutical Distributors* We are party to separate distribution agreements for Remodulin and Tyvaso with two U.S.-based specialty pharmaceutical distributors. The distribution agreements are similar to one another, and generally have one-year terms that renew automatically for additional one-year periods, unless terminated earlier. The agreements contain contractual responsibilities relating to ordering specifications, inventory requirements and exchange rights. We also have agreements with these distributors to perform certain services for us on a fee-for-service basis. If any of our distribution agreements expire or terminate, we may be required under certain circumstances to repurchase any unsold inventory held by our distributors. *International Distributors* We currently sell Remodulin internationally through various distributors. The financial terms and conditions relating to these distributor arrangements are structured in a manner substantially similar to those of our U.S. distribution agreements described above.