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CCR5 gatekeepers

Physicians who prescribe Pfizer Inc.'s Selzentry maraviroc for HIV will have a choice of two companion diagnostics involving different trade-offs: SensiTrop HIV co-receptor tropism assay from Pathway Diagnostics Corp. and Trofile HIV tropism assay from Monogram Biosciences Inc. Pathway believes its test offers greater sensitivity and accelerated turnaround time at a lower price, while Monogram says its test yields more accurate results.

Both SensiTrop and Trofile are CC chemokine receptor 5 HIV tropism assays.

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