The phrase "a reference has been" is correct and usable in written English.
It can be used when indicating that a reference or citation has been made or provided in a document or discussion.
Example: "In the report, a reference has been included to support the findings presented."
Alternatives: "a citation has been" or "a mention has been".
Thus a comparative analysis of the two heme proteins, including horse cytochrome c as a reference, has been performed.
Finally, a reference has been added supporting testing of single doses in clinical trials in the US, regardless of genotoxicity test results.
Analyst firms, such as Morgan Stanley, have quoted the $1bn figure in the past, but this appears to be the first time that a reference has been found in court documents.
A genomic sequence serving as a reference has been the basis of genome-wide SNP discovery utilizing NGS technologies.
Canton-S strain, as a reference, has been cultured in the laboratory since its collection at the beginning of the 20th century in the USA.
However, in this study to avoid operator-dependent bias a correlation-based threshold definition [ 42], with HR-pQCT structure measures as a reference, has been applied.
Glass coming from cathode-ray tube monitors, fluorescent lamps, and crystal glass (from production of home décor items) along with glass deriving from soda-lime glass containers, which has been taken as a reference, have been investigated.
Recently, whole genome resequencing of rice cultivars using Nipponbare, as a reference have been performed using high-throughput sequencers.
It is especially useful for microorganisms, which lack repetitive sequences in their genome, and microarrays using genomic DNA as a reference have been used to identify genes differentially expressed in various growth stages of Mycobacterium tuberculosis [ 7].
The effectiveness of plant diagnostics using real-time simulated measurements as a plant reference has been shown in previous papers.
The following has been added to paragraph 4 of the Results section and a supporting reference has been added to References (see below).
