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Notice of Effectiveness
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Notice of Effectiveness
Effectiveness Date:
March 27, 2012
Accession Number:
0001047469-12-003206
Submission Type:
POS AM
CIK:
0001274792
Company Name:
MERRIMACK PHARMACEUTICALS INC
File Number:
333-175427