** Shares of biotech firm Exicure Inc XCUR.O jumps 47.4%
to $1.97 premarket; set for their best day ever
** Stock top pct gainer across U.S. exchanges
** French pharma Ipsen IPN.PA and XCUR enter into
exclusive agreement to research, develop, and commercialize
XCUR's novel Spherical Nucleic Acids (SNAs) as potential
treatments for Huntington's disease and Angelman syndrome
** Exicure will receive $20 mln upfront and is eligible to
get up to $1 bln in option exercise fees and milestone payments
urn:newsml:reuters.com:*:nBw4PTvQa
** Exicure will be responsible for discovery and certain
pre-clinical development activities
** Up to Friday's close, stock had fallen 23.7% YTD
(Reporting by Dania Nadeem)