Discontinuous laboratory assays

Thus, SCE tests have been largely discontinued by industry and are recommended by regulatory agencies on a limited basis. However, this assay continues to be used as a research tool and in some regulatory settings. For example, despite its poor concordance, the SCE assay continues to be used by the NTP, in part because SCE techniques are sufficiently similar to those used for in vitro chromosomal aberration assays so that the two tests can efficiently be used in parallel by cytogenetic testing laboratories. 

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