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NEW YORK (TheStreet) -- CHANGE IN RATINGS Kronos was upgraded at Wells Fargo. Valuation call, as the stock is down 23% over the past couple of weeks, Wells Fargo said. MarkWest Energy Partners was downgraded at UBS to neutral from buy. More capex with slower distribution growth, UBS said. Twelve-month price target is $65. Nokia was upgraded at Canaccord Genuity to buy. Twelve-month price target ...