TRENDING: Palantir, Robinhood Earnings Due After Market's Tricky OctoberPfizer (PFE) sued Metsera (MTSR) and Novo Nordisk (NVO) on Friday to prevent Novo's proposed $6.5 billion takeover of the smaller obesity-focused biotech company.The move is the second jab in an escalating battle pitting Pfizer and Novo Nordisk. The first came Thursday when Novo issued an unsolicited bid to buy Metsera, a month after Pfizer struck a deal to acquire Metsera for$4.9 billion.Pfizer's lawsuit asserts that Metsera breached ...