Continuing their August slide, the two biotechnology indexesfell again on Friday. The AMEX index of 15 companies lost 1.21points to end at 145.16, down from 161 at the start of themonth. And the Chicago Board Option Exchange Index of 20biotech stocks lost1.93 points to end at 137.77, down from 154.

For the day Seragen and TocorII/Centocor gained $1 to close at$8.62 and $14.75 respectively. Synergen and GensiaPharmaceuticals fell $1.12 to close at $44.37 and $35.37respectively. Genzyme lost $ close at $40.75.

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