Exhibit 10.13 EMPLOYEE RETENTION AGREEMENT AGREEMENT by and between Enzon, Inc., a Delaware corporation (the "Company"), and [ ](the "Employee"), dated as of the 3rd day of August, 2001 (the "Effective Date"). WHEREAS, the Board of Directors of the...Employee Retention Agreement • September 28th, 2001 • Enzon Inc • Biological products, (no disgnostic substances)
