The phrase "at the end precisely" is correct and usable in written English.
It can be used to indicate a specific point in time or detail that is exact or accurate at the conclusion of something.
Example: "The results of the experiment were revealed at the end precisely, leaving no room for doubt."
Alternatives: "exactly at the end" or "specifically at the conclusion".
For example, you might know about the ending precisely because the author begins at the end and then unfolds the plot as to how the story reaches that ending (a reverse chronology).
The longer transcript has its 5′ end precisely at the 3′ end of the upstream trnS.1 coding region, which suggests that the asRNA 5′ end is derived from 3′ processing of a tRNA precursor.
The systematic derivations of elementary and complex periodic patterns, applications of such patterns to workload history might at the end lead to a precisely defined structure of database workload.
Only at the end does one understand exactly how precisely the teeming universe of "In the Fall" spins.
The impact hypothesis was resisted until the nineteen-nineties, when the existence of a huge impact crater formed precisely at the end of the Cretaceous was confirmed.
Beginning at a date difficult to fix precisely (at the end of the 7th or during the 6th century), Athens, in contrast to Sparta, became the first to renounce education oriented toward the future duties of the soldier.
As Michel Foucault, the great historian of sexuality, once observed, sadism is not "a practice as old as Eros," but rather "a massive cultural fact which appeared precisely at the end of the eighteenth century".
For analysis purposes, we assume that all generated packets have to wait until the next resource reservation interval before competing for resources and data transmissions start precisely at the end of contention windows.
Furthermore, several arrays may have assembly errors, suggested by the fact that overlap of assembled BAC clones is found precisely at the end of the array or at a change in orientation of the repeat units e.g. the array at 5p15 (Table 2D).
