The biotechnology stock indexes followed Synergen Inc.'s(NASDAQ:SYGN) precipitous decline on Monday with largedrops of their own. The AMEX Biotechnology Stock Index fell15.72 points to 113.41, while the Chicago Board OptionExchange Biotechnology Index lost 17.05 points, closing at102.37. The two indexes have lost 23 percent and 27 percent,respectively, since Feb. 1.

Among individual issues, Chiron Corp. (CHIR) lost $5.13 a shareto close at 45.63; Idexx Laboratories Corp. (IDXX) fell $4.75 ashare to $27.25; Amgen Inc. (AMGN) continued to slide, losing$3.50 a share to $41.50; MedImmune Inc. (MEDI) shed $3.50 ashare to $14; Genzyme Corp. (GENZ) dropped $3.25 a share to$29.25; Life Technologies Inc. (LTEK) fell $3.25 a share to$19.75; and Gensia Pharmaceuticals Inc. (GNSA) was off $3 ashare to $19.25.

The NASDAQ composite index fell 11.19 points to 652.42.

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