The phrase "allowed exclusively" is correct and usable in written English.
It can be used to indicate that something is permitted only under specific conditions or for a particular group.
Example: "Access to the VIP lounge is allowed exclusively for members of the club."
Alternatives: "permitted solely" or "authorized only".
Treatment of the cells with the mild non-ionic detergent digitonin allows exclusively an efflux of soluble cytoplasmic proteins through the formation of pores in the cell membrane.
The insertion of a narrow band-pass filter HQ420BP (Chroma Technology Corporation, Rockingham, VT, US) in the detection path allows exclusively detecting SHG.
In contrast, the axons from excitatory neurons are often longer and extensively branched, having length ranging from centimetres to several meters (e.g., in a giraffe's neck), allowing exclusively excitatory cortico-cortical connections.
For this procedure, no existing base pairs were removed, no pseudo-knots were allowed and exclusively Watson-Crick pairs were added (see fig. 5 for examples).
Under the provision, Norwegian would become the only company allowed to sail exclusively among the islands without a foreign stop, a service previously provided only by American Classic Voyages, an American company that went bankrupt a few weeks after the terrorist attacks.
Fourth, retrospective inclusion of HCV-infected subjects without coexisting traditional risk factors and retrospective exclusion of individuals with a previous history of CKD allowed us to exclusively study newly diagnosed cases of CKD.
Previously, the NYT had supported both iOS 5 and iOS 6. Moving to iOS 7 exclusively allowed them to utilize the new features of iOS 7 and to do away with a lot of the cruft of the old.
Subsequent lectin chromatography allowed enrichment of exclusively sialylated rhEPO.
