	warburg begins tender offer for symbion symb symbion inc said warburg pincus capital co l p began a tender offer to purchase up to mln shares or about pct of symbion s shares at dlrs per share warburg already owns about pct of symbion symbion has shares outstanding the company makes artificial hearts symbion said its board and management are carefully reviewing the offer and on or before march will advise its shareholders on whether it accepts or rejects the offer if the tender offer is successful warburg wll own about pct of symbion reuter 
