The phrase "assays failed" is correct and usable in written English.
It can be used in contexts related to scientific testing or analysis, particularly in laboratories or research settings, to indicate that the tests did not produce the expected results.
Example: "After conducting several experiments, we found that the assays failed to yield any significant data."
Alternatives: "tests were unsuccessful" or "analyses did not succeed".
Functional assays failed to show changes in either activity or recombinant proteins levels for all three variants.
Moreover, the PEA and PAR assays failed to classify HSV-1 N4 as drug resistant and indicate that these technologies alone are inadequate for identifying resistant virus.
However, despite comparable mRNA levels among the cells, the results of Western blotting and transport assays failed to show functional Ct-OATP1B3 expression in any HEK293 cells expressing either Ct-OATP1B3-C or CT-OATP1B3-v1.
The PCR assays failed to detect OsHV-1 in any extracts except for the known positives and it is concluded that OsHV-1 is absent in this survey of New Zealand molluscs.
Primer directed amplification assays failed to detect species markers (femA, katA, sbi, spa).
A similar battery of coimmunoprecipitation assays failed to demonstrate any interaction between tagged VP24 and tagged VP19 (data not shown).
But we noted that the new, specific assays failed to optimize while testing different regions would alter the purpose of the study.
Conversely, two-hybrid, gel shift, and fluorescence anisotropy assays failed to detect an interaction between MTCP1 and IκBα (data not shown).
In this case, the ChIP assays failed to detect c-Myb at the CCNE1 target gene in asynchronous cells, but did so when cell sorting revealed the differences in the G2/M subpopulation.
However, while tissue burden of mice were consistently increased when CgCDR1 and PUP1 were overexpressed (Fig. 8), virulence assays failed to discriminate in a statistical manner survival curves obtained with the overexpressing strains (Fig. 9).
No assays failed in the pilot set.
