The phrase "a variation of the protocol" is correct and usable in written English.
It can be used when discussing different forms or adaptations of a specific protocol in various contexts, such as technology, research, or procedures.
Example: "The team implemented a variation of the protocol to better suit the needs of the project."
Alternatives: "an adaptation of the protocol" or "a modification of the protocol".
Of particular relevance to study intrinsic stability is a variation of the protocol ISOS-D-1 in which devices are not stressed keeping them in the dark under nitrogen atmosphere and ambient temperature [43].
The fact that the random sample heuristic performed equally well as a more elaborate variable neighborhood search heuristic, led us to exploring a variation of the protocol where each node keeps only a subset of all its neighbors in its local memory (creating a partial view of the full neighbor set).
Whole-mount in situ hybridization was performed using a variation of the protocol described by Tautz and Pfeifle [ 40].
Chromatin was prepared with the Millipore/Upstate Chromatin Immunoprecipitation (ChIP) Assay Kit (Millipore) according to the instruction provided by the producer, using a variation of the protocol described at the Upstate website.
Adhesion assays were performed using a variation of the protocol described by Scott et al (2001): 4 × 10 serum starved (20 h) PC3-GFP cells were added to a confluent BMEC layer with or without AA (10 μℳ).
In [10], the authors propose a variation of this protocol where the predeployed key is used only for a restricted period of time during which nodes establish pairwise keys.
Furthermore, a protocol similar to Scheme 3 was proposed in [40] and was termed multiple-access amplify-and-forward (MAF), which is a variation of the NAF protocol.
To optimize efficiency of the restriction-ligation for the final construct containing 11 transcription units (cL2-13*), a variation of this protocol was used as follows.
Briefly, C57BL/10 mice and BALB/c mice were subjected to four different drug cocktails of antibiotics, given in drinking water for 4 weeks before IR treatment, on the basis of a variation of the commensal depletion protocol.
The protocol running within each cluster is a variation of the near-optimum DQCA protocol for infrastructure-based WLANs [4] which, despite requiring the presence of a central point coordinator, operates in a completely distributed manner.
Library preparation was performed by BGI (Hong Kong) using a variation of the Illumina's standard protocol.
