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GlaxoSmithKline ($GSK) has already made some moves to sell off some of its older meds. But now, it's making more that could end up much, much bigger.

As Sky News reports, the pharma giant has solicited bids from a handful of private equity firms--Advent International, Blackstone and KKR included--for some or all of the 50 or so drugs in its established products portfolio, worth up to £7.5 billion ($12.6 billion). A spokesman for GSK told Sky the company is currently evaluating its options.