Exhibit 10.1 CUBIST PHARMACEUTICALS, INC. REGISTRATION RIGHTS AGREEMENT This REGISTRATION RIGHTS AGREEMENT (this "AGREEMENT") is made as of January 27, 2000 by and among (i) Cubist Pharmaceuticals, Inc., a Delaware corporation (the "COMPANY"), (ii)...Registration Rights Agreement • February 8th, 2000 • Cubist Pharmaceuticals Inc • Pharmaceutical preparations • Massachusetts
