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<PAGE> EXHIBIT 23.3 ACCOUNTANTS' CONSENT We consent to the incorporation by reference in this registration of Orchid BioSciences, Inc. ("Orchid") on Form S-8 of our report dated February 19, 1999, on the 1998 financial statements of GeneScreen, Inc. and subsidiaries, appearing in Orchid's prospectus filed on May 4, 2000. /s/ Deloitte & Touche LLP ------------------------- Deloitte & Touche LLP Dallas, Texas January 2, 2001
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