The phrase 'has been mutating' is correct and usable in written English.
It is a verb phrase, which is formed by combining the present perfect verb tense form of the verb 'mutation' with the auxiliary verb 'has been'. You can use this phrase in a sentence when you want to describe a process that began in the past and is still continuing in the present. For example, "The virus has been mutating quickly since its initial outbreak."
Several scientists have speculated that, whatever its origin, the A(H5N1) virus has been mutating rapidly in southern China because farmers there started vaccinating after a 1997 outbreak in Hong Kong forced the culling of 1.5 million chickens.
The idea of these mutants has been mutating for a long time.
The topography of UK dance music has been mutating at a fascinatingly frenzied rate, and while we'll never stop carrying a torch for UK funky, the constant blitz of new sounds keeps us feeling really fucking good about what's coming up next.
The impact of an expressed somatic mutation depends upon which gene has been mutated.
The telltale appearance of truncated proteins indicates that the gene has been mutated and that the patient has at least the first signs of colon cancer.
A crucial threonine thought to be involved in a short bromine-to-oxygen halogen bond to the inhibitors in the wild type has been mutated to the structurally similar residues alanine, cysteine, serine and valine.
Now, in the 14 May issue of Science, Kobayashi and his colleagues report that the same gene has been mutated in white grapes by a bit of pushy DNA, resulting in loss of skin color.
CK19CreERT encodes the Cre recombinase fused to a region of the estrogen receptor that has been mutated to bind tamoxifen.
This is exemplified most strongly by strains in which the A box internal control element has been mutated (Figure 2).
Characterisation of the U line has shown that an active transposon-silencing process that targets ZAM and Idefix has been mutated in this line.
Here, we have taken advantage of a transgenic mouse model in which a tyrosine motif in the cytoplasmic tail of MHC I has been mutated.
