Thermo Fisher Scientific Inc, Waltham, Mass, has launched the Applied Biosystems TaqPath 1-step multiplex PCR master mix. The preformulated, universal, 4x concentration mix is designed to deliver sensitive and reproducible detection of up to four RNA or DNA targets in a single multiplex reaction. Two formulations of the multiplex assay-compatible master mix are available: one with mustang purple reference dye, and one labeled “No ROX,” which has no passive reference dye. Both mixes enable measurement of the JUN dye or a similar emission wavelength dye in the channel typically used to measure ROX dye. The two formulations join the line of Applied Biosystems TaqPath general purpose reagents, quantitative polymerase chain reaction (qPCR) and real-time qPCR master mixes for clinical labs, molecular diagnostics test developers, other organizations performing gene expression analysis, especially those in high-throughput environments. For more information, visit AACC booths 2334 and 2145, or Thermo Fisher Scientific.