Although Immunex Corp. shares staged a small rebound Friday,gaining $1.13 to $32.63 after plunging $10.50 on Thursday, theAMEX Biotechnology Index closed the week seeking a newbottom. Friday's closing of 162.79 was off nearly 10 percent forthe week. The index has attained its base of 200 only threetimes since the beginning of March.

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