 Meridian Bioscience Inc. NASDAQ:VIVO edged out GenMark Diagnostics Inc. NASDAQ:GNMK as the top gainer in the March GenomeWeb Index with a 25 boost in its share price compared to GenMarks 22.5 increase. At the other end of the spectrum were Adaptive Biotechnologies Corp. NASDAQ:ADPT, whose shares plummeted 28, Burning Rock Biotech BRN with a 25 decline and Quanterix Corp. QNTX, which fell 22.8. 