The phrase "already existing classes" is correct and usable in written English.
It can be used when referring to classes or categories that are currently in place or have been established prior to a certain point in time.
Example: "The new curriculum will build upon the already existing classes to enhance the learning experience for students."
Alternatives: "currently available classes" or "pre-existing classes".
The DUL ontology offers seamless extensibility, since both PaaS Characteristics and parameters are defined as classes; therefore, extending the ontology with new characteristics and parameters requires the addition of new specialized subclasses of the already existing classes, which is less complicated than adding ontology properties.
In this review we made an evaluation of present data regarding the new classes and the new molecules from already existing classes of antibiotics and the ongoing trends in antimicrobial development.
Recently, large-scale transcriptomics studies have revealed that a high proportion of the eukaryotic genome is transcribed, and this has led to the proposal of new classes of ncRNAs and to the addition of many new members to already existing classes.
Recently, IDSA supported a proGram, called " the ′10 × ′20′ initiative", to develop ten new systemic antibacterial drugs within 2020 through the discovery of new drug classes, as well as to find possible new molecules from already existing classes of antibiotics [ 7].
Notice that in the second case it suffices to look only in the LCA of the isoforms for an already existing read class.
New drugs might also be me-too or follow-on drugs, which enter the market in an already existing drug class and are chemically very similar to already approved drugs.
These existing classes are virtually identical.
No isolate was resistant to all existing classes.
James wrote, "There's an arrogance in high school students that manifests during the college application process, but it's an arrogance that correlates with already existing racial and class privilege".
The resulting eagle-i resource ontology (ERO) is a combination of classes already existing in external biomedical ontologies and taxonomies, and classes we created in order to be able to represent the information about resources inventoried by eagle (6).
Paths for classes already existing for smaller values of R are shown as gray arrows, paths for new classes as black arrows.
