Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Units^F1,F2,F5,F4	Dec 31, 2015	P	11,778	$2.89	A	4,798,951	I	By Accipiter Life Sciences Fund (Offshore), Ltd.
Common Units^F1,F2,F3	holding	—	—		—	3,614,846	I	By Accipiter Life Sciences Fund, LP

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1This Form 4 is filed jointly by Accipiter Life Sciences Fund, LP ("ALS Fund"), Accipiter Life Sciences Fund (Offshore), Ltd. ("ALS Offshore"), Accipiter Capital Management, LLC ("Accipiter Management"), Candens Capital, LLC ("Candens Capital"), and Gabe Hoffman (collectively, the "Reporting Persons").
F2Each Reporting Person may be deemed to be a member of a group that owns more than 10% of the Issuer's outstanding Common Units. Each Reporting Person disclaims beneficial ownership of the Common Units reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such Common Units for purposes of Section 16 or for any other purpose.
F3Common Units directly owned by ALS Fund. Accipiter Management, as the investment manager of ALS Fund, may be deemed to be the beneficial owner of the Common Units directly owned by ALS Fund. Each of Candens Capital, as the general partner of ALS Fund, and Mr. Hoffman, as the managing member of each of Candens Capital and Accipiter Management, may be deemed to be the beneficial owner of the Common Units directly owned by ALS Fund.
F4Common Units directly owned by ALS Offshore. Accipiter Management, as the investment manager of ALS Offshore, may be deemed to be the beneficial owner of the Common Units directly owned by ALS Offshore. Mr. Hoffman, as the managing member of Accipiter Management, may be deemed to be the beneficial owner of the Common Units directly owned by ALS Offshore.
F5The price reported in Column 4 is a weighted average price. These Common Units were purchased in multiple transactions at prices ranging from $2.87 to $2.94. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Units purchased at each separate price within the ranges set forth in footnote 5 to this Form 4.