National indices rose more than 1 percent April 24 but tri-county stocks were split with a near equal distribution of gains and losses. Tri-county biotechs did well, with shares climbing at Westlake Village-based Arcutis Biotherapeutics, major employer Atara Biotherapeutics and Thousand Oaks biotech giant Amgen. Arcutis jumped 8.94 percent to close at $29.61, Atara rose…
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