** Shares of special purpose acquisition co, Avista Public
Acquisition Corp II AHPA.O , up 2.4% at $10.25 after market
** Co to merge with a unit of biopharma co Ligand
Pharmaceuticals Inc LGND.O in $850 mln deal urn:newsml:reuters.com:*:nBw12Gcnqa
** The unit, called OmniAb Inc, is LGND's antibody discovery
business and will become publicly traded as a result
** Private equity firm Avista Capital Partners, which is the
backer of the SPAC, will invest $115 mln in the combined co,
while LGND will contribute $15 mln, companies say
** Deal expected to close in second half of 2022
** OmniAb's business consists of genetically modifying
animals like rats and mice to develop potential therapeutic
candidates for humans
** SPAC raised $230 mln in its IPO in August
(Reporting by Niket Nishant in Bengaluru)
((Niket.Nishant@thomsonreuters.com;))