Nov 13 (Reuters) - Mersana Therapeutics Inc ( MRSN ):
* DAY ONE BIOPHARMACEUTICALS TO ACQUIRE MERSANA THERAPEUTICS
* MERSANA THERAPEUTICS INC ( MRSN ) - DAY ONE TO BUY MERSANA FOR UP
TO $285
MILLION
* MERSANA THERAPEUTICS INC PROPOSED DEAL FOR $25.00 PER
SHARE IN
CASH
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