Amdt. To The Aclara Employee Stock Purchase Plan

Exhibit 10.31 AMENDMENT TO THE ACLARA BIOSCIENCES, INC. EMPLOYEE STOCK PURCHASE PLAN Pursuant to the authority reserved to the Board of Directors (the " Board" ) of ACLARA BioSciences, Inc., a corporation organized under the laws of State of Delaware, under Section 12 of the ACLARA BioSciences, Inc. Employee Stock Purchase Plan (the " Plan" ), the Board hereby amends the Plan, subject to stockholder approval, as follows: 1. Section 2 of the Plan is hereby amended ...