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Shares of

Lifeline Systems

(LIFE) - Get aTyr Pharma, Inc. Report

were among the best-performing health-related stocks Thursday, surging 19% after the company agreed to be acquired by

Philips Electronics

(PHG) - Get Koninklijke Philips NV Report

for about $690 million in cash.

The deal values Lifeline, which provides personal emergency response services, at $47.75 a share, a premium of 21% over Wednesday's closing price of $39.49. Including about $60 million in cash already held by Lifeline, the total deal is worth $750 million. "The acquisition of Lifeline is an important step on our roadmap for growth in health care," Philips said in a statement. Lifeline expects to post 2005 sales of about $150 million, a 15% increase over 2004. Shares of Lifeline recently were trading up $7.43 to $46.92 while Philips shares gained 19 cents to $31.62.

Immucor

( BLUD) rose 4% after the company, which sells reagents and systems used to identify the properties of blood prior to a transfusion, said it received a purchase order for eight of its Galileo systems from Blood Systems Laboratories. "Blood Systems Laboratories is one of the largest donor testing laboratories in the United States," Immucor said. "We are very pleased that this prestigious laboratory has selected Galileo." Shares of Immucor were up $1.19 to $28.25.

Shares of

UnitedHealth Group

(UNH) - Get UnitedHealth Group Incorporated Report

traded actively after the health insurer posted better-than-expected fourth-quarter results and increased its 2006 earnings forecast. The company earned $870 million, or 65 cents a share, on sales of $12.05 billion. Earnings included 2 cents a share in market-launch expenses for the Medicare Part D prescription drug benefit program. Excluding that expense, the company earned 67 cents a share. Analysts polled by Thomson First Call expected earnings of 66 cents a share, before items, on sales of $11.7 billion. During the year-earlier period, the company earned $739 million, or 54 cents a share, on sales of $10.5 billion.

Looking ahead, UnitedHealth Group now sees 2006 earnings of $2.85 to $2.90 a share, up from its earlier view of $2.82 to $2.85 a share. Both forecasts include stock-based compensation costs. Shares were trading down 15 cents to $61.07.

NuVasive

TheStreet Recommends

(NUVA) - Get NuVasive, Inc. Report

rose 1% after the medical-device maker reiterated its 2005 sales guidance. The company continues to project sales of $61 million to $62 million, in line with the $61.5 million that analysts are forecasting. Shares were trading up 11 cents to $18.34.

Shares of

Meridian Bioscience

(VIVO) - Get Meridian Bioscience, Inc. Report

fell modestly after the maker of diagnostic test kits posted better-than-expected first-quarter earnings and reaffirmed its 2006 financial targets. The company earned $4 million, or 15 cents a share, on sales of $24.9 million. Analysts expected earnings of 14 cents a share. A year earlier, the company earned $2.1 million, or 9 cents a share, on sales of $18.8 million.

For 2006, Meridian continues to project earnings of 60 cents to 63 cents a share, slightly below analysts' average estimate of 64 cents, on sales of $103 million to $107 million. Shares were trading down 12 cents to $23.71.

Heavy health care volume movers included

Pfizer

(PFE) - Get Pfizer Inc. Report

, up 96 cents to $25.05;

Elan

(ELN)

, down $1.10 to $15.16;

Genta

( GNTA), down 4 cents to $2.15;

Merck

(MRK) - Get Merck & Co., Inc. Report

, up 29 cents to $33.60;

Schering-Plough

( SGP), up 29 cents to $20.24;

Bristol-Myers Squibb

(BMY) - Get Bristol-Myers Squibb Company Report

, up 44 cents to $22.60;

Insmed

(INSM) - Get Insmed Incorporated Report

, down 17 cents to $2.95; and

Amgen

(AMGN) - Get Amgen Inc. Report

, down 34 cents to $78.49.