Exhibit 4.6 STOCK PURCHASE AGREEMENT LJL Biosystems, Inc. 404 Tasman Drive Sunnyvale, CA 94089 Ladies & Gentlemen: The undersigned, _____________________ (the "Investor"), hereby confirms its agreement with you as follows: 1. This Stock Purchase...Stock Purchase Agreement • February 3rd, 2000 • LJL Biosystems Inc • Laboratory analytical instruments • Delaware
