Life sciences research products supplier Bio-Rad Laboratories Inc. of Hercules, Calif., has sold its confocal microscopy business, based in Hemel Hempstead, UK, to Carl Zeiss GmbH of Jena, Germany. The move is part of an ongoing investment in broadening the applications expertise at Zeiss, said Ulrich Simon, head of the microscopy business group at that company. Terms of the sale have not been disclosed.