The phrase "already been characterised" is correct and usable in written English.
It can be used when discussing something that has previously been described or defined in a certain way.
Example: "The phenomenon has already been characterised in several studies, highlighting its key features."
Alternatives: "previously defined" or "already described".
Our results increase the number of Nup candidates across all eukaryote supergroups where genome data are available (except Opisthokonts, where a full complement had already been characterised in advance of all three studies).
For another six species where markers had already been characterised, we found between three and 11 new polymorphic markers.
Inter-strain variations in loci such as those encoding lipooligosaccharide (LOS) [ 14], capsule [ 14] or restriction-modification (RM) systems [ 15] have already been characterised.
A member of the second group, PP2A from T. cruzi (Tc00.1047053511021.10), has already been characterised as important for the complete transformation of trypomastigotes into amastigotes during the life cycle of the parasite [ 87].
PX-12 (a thioredoxin inhibitor) (Welsh et al, 2003a), and pleurotin and PX478 (thioredoxin reductase inhibitors) (Powis et al, 2003; Welsh et al, 2003b, 2004) have already been characterised as inhibitors of HIF1 α.
Each NumtS was assigned an identifying numeric code, according to increasing values starting from chromosome 1; a letter code (A, B, or C) was assigned to only 3 NumtS, because they were located later, when all other NumtS had already been characterised.
Fundraising attempts have been characterised by failure.
"Throughout, this matter has been characterised by delay and muddle.
They also argue this campaign has been characterised by "a loop of misinformation and scaremongering".
The talks have been characterised as traditional, with no new "know-how" from policy makers.
Lysozymes have been characterised in several insects.
