The phrase "are extracted only" is correct and usable in written English.
It can be used when specifying that something is exclusively taken or obtained from a particular source or context.
Example: "The data for this analysis are extracted only from verified sources to ensure accuracy."
Alternatives: "are solely extracted" or "are exclusively extracted".
If governments are stripping citizens' rights, if communities are divided, if resources are extracted only to benefit the wealthy elite, then we will be aiding and abetting the status quo, leading to a shrinking and less vibrant civil society in the long run.
Using the CSP, features are extracted only from the selected channels and are forwarded to the classifier.
Although raw materials are extracted only in these two aggregated sectors (see Fig. 4; Table 2), the overwhelming part of the extracted raw materials are not directly delivered to final demand, but purchased by other sectors of the economy for further processing.
In the following, links are extracted only
The features are extracted only from the amino acid sequence and, using SSpro (Cheng et al., 2005b), from the predicted secondary structure.
Thus for 14 samples we used DNA from two independent extractions and for one from three extractions, while the remaining 113 samples were extracted only once.
The loosely bound TAZ fraction extracted through two sonications accounted for 85±5%% of the total TAZ, while the strongly bound TAZ was extracted only with an exhaustive Soxhlet extraction and corresponded to the remaining 15±5%%.
In the protein extraction experiment, E-cadherin and vezatin were extracted only in the presence of Triton X-100 (Fig 1B, middle left panel).
I am not suggesting that the right can be extracted only through overeager interpretations of ECJ decisions.
The hidden prey can be extracted only with some clever statistics.
They should be extracted only in sufficient quantities to meet carefully assessed needs".
