The phrase "are unable to differentiate" is correct and usable in written English.
It can be used when discussing a lack of ability to distinguish between two or more things.
Example: "Many students are unable to differentiate between similar concepts in their studies."
Alternatives: "cannot distinguish" or "are not able to tell apart".
EST sequencing has led to the development of a limited Toxoplasma cDNA array [ 22- 24] that focused on tachyzoite-bradyzoite transitions in cell culture models of bradyzoite differentiation [ 22] and explored gene expression in mutants that are unable to differentiate [ 23, 24].
The banks' lending criteria are frequently so blinkered that they are unable to differentiate the duds from the dynamic.
We find that participants show fairly good knowledge of the basic mechanics of the plan, but are unable to differentiate among various investment options.
The widespread adoption of these titles confuses some consumers, who are unable to "differentiate among the blurring traditional channel segments of the advice market," according to a recent study by Cerulli Associates, a Boston consulting firm.
But if they buy cheap, nonrefundable leisure fares, which have to be bought a week or two in advance and often have restrictions like requiring a Saturday-night stay, the airlines are unable to differentiate them from leisure travelers.
The current magnetic flux leakage (MFL) tank inspection machines can detect and locate defects on both the top and bottom of a plate, but generally they are unable to differentiate between top and bottom.
Parental MNNG/HOS cells differentiated into osteoblasts, but were unable to differentiate towards adipocytes or chondrocytes (data not shown).
Clinical or demographic variables were unable to differentiate the three clusters.
Corresponding Blank polymers were unable to differentiate between analytes, suggesting that imprinting phenomenon was responsible for the recognition properties.
One day you will be unable to differentiate yourself from your machines, just as today you cannot differentiate yourself from your bacteria.
One in four (24%) were unable to differentiate any of the pirate websites from the real deal, with the figure even higher among parents, at 36%.
