(Bloomberg) -- Shares of WuXi AppTec Co. and WuXi Biologics (Cayman) Inc. slumped in Hong Kong as a bipartisan group of US lawmakers urged a formal probe against the companies, potentially placing them on sanctions lists.Most Read from BloombergMusk Says Putin Can’t Lose in Ukraine, Opposes Senate BillStanChart Weighs Break Up of Corporate, Investment BankPutin Seeks Revenge on a World Order He Once Wanted to JoinLyft Corrects Earnings Margin Gain to 50 Basis Points From 500Retail Traders Are Lo