The phrase "according to the protocol provided by" is correct and usable in written English.
You can use it when referencing specific guidelines or procedures that have been established by a particular source or authority.
Example: "According to the protocol provided by the health department, all staff must wear masks during the event."
Alternatives: "as per the guidelines set by" or "following the procedures outlined by".
Genotyping was performed according to the protocol provided by the manufacturers (Invitrogen, Breda, The Netherlands; Promega, Leiden, The Netherlands).
Real-time PCR was performed on the LightCycler system (FastStart DNA Master SYBR Green I, Roche) according to the protocol provided by the manufacturer.
DNA was isolated using the GenElute Bacterial Genomic DNA kit (Sigma-Aldrich, UK) according to the protocol provided by the manufacturer.
Then, cells were resuspended in binding buffer and stained with Annexin V-FITC and PI detection kit according to the protocol provided by the manufacturer.
According to the protocol provided by Navy Secretary George M. Robeson, command of the expedition was turned over to Budington, under whom discipline further devolved.
Total cellular RNA was extracted with Trizol (Invitrogen, Carlsbad, CA) according to the protocol provided by the manufacturer.
The supernatants were analyzed for β-gal activity according to the protocol provided by the manufacturer of the Beta-Glo assay system.
MAbs were biotinylated with N-hydroxysuccinimide biotin ester (diluted in DMSO) in 0.1 M NAHCO3 (according to the protocol provided by Pierce Biotechnology).
The enzyme-linked immunosorbent assay (ELISA) for IFN-γ was performed according to the protocol provided by the manufacturer (PBL Biomedical Laboratories, Piscataway, NJ).
Soluble recombinant BDNF or BSA was labeled with biotin using Easy-link biotin according to the protocol provided by the manufacturer (Pierce).
One microgram of DNase-treated RNA was reverse transcribed using SuperScript III First-strand synthesis SuperMix (Invitrogen) according to the protocol provided by the manufacturer.
