The phrase "are not only too" is not correct and usable in written English as it is incomplete and lacks context.
It can be used in a comparative structure, typically followed by "but also" to present two related ideas or qualities.
Example: "These shoes are not only too big, but also too heavy for me."
Alternatives: "are not just too" or "are not merely too".
Similar problems are often reported by other scientists – indeed many complain that federally approved cell lines are not only too few but also poor in quality.
Banks are not only too big to fail; they're also too big to manage – a notion that is being applied to other massive businesses.
The financial system has become even more concentrated, exacerbating the problem of banks that are not only too big, too interconnected, and too correlated to fail, but that are also too big to manage and be held accountable.
For those of us who are not only too young but also too female, too black, too gay or too anything, millennial is just another way to divide us.
And they ginned up a phony emergency over the growth of the national debt, using it to compel budget cuts that are not only too big, but are directed at programs that, again, help the very Americans Mr. Romney says he cares so much about.
"Buying time" no longer seems like an adequate description of what is happening, if only because technology companies, even more so than the banks, are not only too big too fail but also impossible to undo – let alone replicate – even if a new government is elected.
After several years or months of commencement of operations, the service is not only too expensive, limited but inefficient.
"The share is not only too low, it is also declining.
The decision raised concerns that Wall Street was not only too big to fail, but also too big to indict.
The corn bisque, by contrast, is not only too sweet, competing with the shrimp, but bland and sludgy too.
But the Patriots' method was not only too high-tech, it had been discussed and denounced as blatant cheating.
