The phrase "at a certain locus" is correct and usable in written English.
It can be used in contexts related to specific locations or points, often in scientific, mathematical, or philosophical discussions.
Example: "The experiment was conducted at a certain locus to observe the effects of the variable."
Alternatives: "at a specific point" or "at a particular location".
Consider a population consisting at a certain locus of three genotypes: A1A1, A1A2, and A2A2.
A few DNA methylation studies of different human races have been carried out recently, which reveal a distinct pattern of CpG methylation at a certain locus in the autosomal DNA (Table 2).
In brief, since the MLPA dosage quotient ratios of the individuals at a certain locus are distributed according to a mixture of normal distributions, it is possible to assign to each individual a posterior probability of being located within one of the normal distributions that represent each copy number state.
When this dropout occurs at a certain locus (locus i), no dropouts can occur at the other loci.
When two dropouts occur at a certain locus (locus i), no dropout can occur at the other analyzed loci.
Alpha a measure of the locus heterogeneity that indicates the proportion of families with alleles linked to disease at a certain locus.
To reiterate, mutation combines information from multiple loci as it changes a certain locus.
First, only point mutations changing the allele type at a certain gene locus are being considered in these models.
Since the heterogeneity patterns were heritable through subsequent cloning, they could be the result of specific variation in epigenetic states at a certain genomic locus [ 26].
However, as it has been reported that transcriptional recruitment at certain locus may affect the expression of adjacent genes, we do not exclude the possibility that the acquirement of the transcription activity in the CCAT1-L locus during CRC pathogenesis may also contribute to the regulation of MYC transcription.
This type of correlation is also expected if missing data are due to "true missingness"—for example, null alleles segregating in the population at certain loci, as a result of polymorphic deletions in primer regions (e.g., Pemberton et al. 1995; Dakin and Avise 2004).
