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- Credit Suisse shares fell almost 55% Monday after UBS agreed to buy the lender for $3.2 billion.
- Swiss authorities drove the takeover to try to stop Credit Suisse's troubles spreading to other banks.
- European bank stocks dropped in a sign the attempt to calm nerves may not be paying off.
Credit Suisse shares fell over 50% Monday, as European bank stocks recouped losses, after UBS agreed to take over the beleaguered Swiss banking giant.