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Hologic Inc. regained some ground after two down days following its release of quarterly results that included a net loss of $5.4 million, or 2 cents per diluted share. Revenue was $612 million, better than expected but still down from a year before. ‘‘We clearly have work to do to return to sustainable top and bottom line growth,’’ said Stephen MacMillan, named CEO in November after Carl Icahn disclosed a 13 percent stake in the Bedford company.