Courtesy of BD Biosciences Pharmingen
 COLOR CODING: Multiplexed bead-based assays, like BD Biosciences' Cytometric Bead Array (shown), test for multiple analytes in a single vial. The key is in the colors: one hue indicates the bead ID, and the intensity of the second, how much protein has been captured.

In today's fast-paced research environment, technologies for speedy, cost-efficient analyses reign supreme. As part of this general trend, techniques for multiplexing, that is, simultaneously performing different assays on the same sample within the same reaction vessel, are on the rise.

"Multiplexed bead-based assay platforms are becoming increasingly popular, because they enable a great deal of quantitative information to be obtained with significant savings in labor and sample volume ... using currently available instrumentation," says Kevin Reagan, vice president of immunology at BioSource International in Camarillo, Calif. "These approaches are of broad interest because they can be used for virtually any biologic...

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