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Here are Friday's top research calls, including upgrades for AK Steel, ServiceNow, Qualcomm and Twitter, and downgrades for McKesson, Mead Johnson and GNC.
Stock losses escalated in the final hour as an increase in Treasury yields hit defensive names in the utilities and materials sectors.
Stocks hold mixed on Thursday afternoon as Bristol-Myers Squibb and Celgene push health care higher, while defensive names slip on a spike in Treasury yields.
Level 3 (LVLT) and CenturyLink (CTL) are reportedly in advanced merger talks.